actually what is my problem?
i run sudo apt-get update and this is the result:





Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise InRelease
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise Release.gpg
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise Release
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/main TranslationIndex
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/multiverse TranslationIndex
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/restricted TranslationIndex
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/universe TranslationIndex
Err cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/main i386 Packages
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Err cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/multiverse i386 Packages
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Err cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/restricted i386 Packages
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Err cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/universe i386 Packages
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/main Translation-en_US
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/main Translation-en
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/multiverse Translation-en_US
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/multiverse Translation-en
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/restricted Translation-en_US
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/restricted Translation-en
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/universe Translation-en_US
Ign cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213) precise/universe Translation-en
Ign http://archive.ubuntu.com precise InRelease
Ign http://security.ubuntu.com precise-security InRelease
Ign http://archive.ubuntu.com precise-updates InRelease
Err http://security.ubuntu.com precise-security Release.gpg
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise Release.gpg
Connection failed [IP: 91.189.92.200 80]
Ign http://security.ubuntu.com precise-security Release
Err http://archive.ubuntu.com precise-updates Release.gpg
Connection failed [IP: 91.189.92.202 80]
Ign http://archive.ubuntu.com precise Release
Ign http://archive.ubuntu.com precise-updates Release
Ign http://security.ubuntu.com precise-security/main TranslationIndex
Ign http://security.ubuntu.com precise-security/multiverse TranslationIndex
Ign http://security.ubuntu.com precise-security/restricted TranslationIndex
Ign http://security.ubuntu.com precise-security/universe TranslationIndex
Ign http://archive.ubuntu.com precise/main TranslationIndex
Ign http://archive.ubuntu.com precise/multiverse TranslationIndex
Ign http://archive.ubuntu.com precise/restricted TranslationIndex
Ign http://archive.ubuntu.com precise/universe TranslationIndex
Ign http://archive.ubuntu.com precise-updates/main TranslationIndex
Ign http://archive.ubuntu.com precise-updates/multiverse TranslationIndex
Ign http://archive.ubuntu.com precise-updates/restricted TranslationIndex
Ign http://archive.ubuntu.com precise-updates/universe TranslationIndex
Err http://security.ubuntu.com precise-security/restricted Sources
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/main Sources
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/multiverse Sources
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/universe Sources
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/main i386 Packages
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/restricted i386 Packages
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/universe i386 Packages
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/multiverse i386 Packages
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/main Translation-en_US
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/main Translation-en
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/multiverse Translation-en_US
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/multiverse Translation-en
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/restricted Translation-en_US
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/restricted Translation-en
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/universe Translation-en_US
Connection failed [IP: 91.189.92.200 80]
Err http://security.ubuntu.com precise-security/universe Translation-en
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise/main Sources
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise/multiverse Sources
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise/restricted Sources
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise/universe Sources
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise/main i386 Packages
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise/restricted i386 Packages
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise/universe i386 Packages
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise/multiverse i386 Packages
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise-updates/restricted Sources
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise-updates/main Sources
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise-updates/multiverse Sources
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise-updates/universe Sources
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise-updates/main i386 Packages
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise-updates/restricted i386 Packages
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise-updates/universe i386 Packages
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise-updates/multiverse i386 Packages
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise/main Translation-en_US
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise/main Translation-en
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise/multiverse Translation-en_US
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise/multiverse Translation-en
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise/restricted Translation-en_US
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise/restricted Translation-en
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise/universe Translation-en_US
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise/universe Translation-en
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise-updates/main Translation-en_US
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise-updates/main Translation-en
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise-updates/multiverse Translation-en_US
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise-updates/multiverse Translation-en
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise-updates/restricted Translation-en_US
Connection failed [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com precise-updates/restricted Translation-en
Connection failed [IP: 91.189.92.202 80]
Err http://archive.ubuntu.com precise-updates/universe Translation-en_US
Connection failed [IP: 91.189.92.201 80]
Err http://archive.ubuntu.com precise-updates/universe Translation-en
Connection failed [IP: 91.189.92.200 80]
W: Failed to fetch cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213)/dists/precise/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213)/dists/precise/multiverse/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213)/dists/precise/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu-Studio 12.04.2 _Precise Pangolin_ - Release i386 (20130213)/dists/precise/universe/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...se/Release.gpg Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...ty/Release.gpg Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...es/Release.gpg Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...source/Sources Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...source/Sources Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...source/Sources Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...source/Sources Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...-i386/Packages Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...-i386/Packages Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...-i386/Packages Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...-i386/Packages Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...source/Sources Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...-i386/Packages Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...nslation-en_US Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...Translation-en Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...nslation-en_US Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...Translation-en Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...nslation-en_US Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...Translation-en Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...nslation-en_US Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/di...Translation-en Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.202 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...nslation-en_US Connection failed [IP: 91.189.92.201 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dis...Translation-en Connection failed [IP: 91.189.92.200 80]

E: Some index files failed to download. They have been ignored, or old ones used instead