Here goes with my first post.

Encountered some problms trying to install minecraft on two near identical machines running Ubuntu. The simple plan was to update Ubuntu from the terminal and then install minecraft using the Minecraft Installer method.

This worked well for the first machine. The second machine throws up some errors which you can see at the end of the following log of sudo apt-get update. This machine has also substantially slower browsing since the recent update attempts. Any pointers would be appreciated.

hamish@hamish-HP-Pavilion-dv2000-GG176PA-ABG:~$ sudo apt-get clean
[sudo] password for hamish:
hamish@hamish-HP-Pavilion-dv2000-GG176PA-ABG:~$ sudo apt-get update
Get:1 http://au.archive.ubuntu.com precise Release.gpg [198 B]
Get:2 http://au.archive.ubuntu.com precise-security Release.gpg [198 B]
Hit http://au.archive.ubuntu.com precise Release
Hit http://au.archive.ubuntu.com precise-security Release
Hit http://au.archive.ubuntu.com precise/main Sources
Hit http://au.archive.ubuntu.com precise/restricted Sources
Hit http://au.archive.ubuntu.com precise/universe Sources
Hit http://au.archive.ubuntu.com precise/multiverse Sources
Hit http://au.archive.ubuntu.com precise/main i386 Packages
Hit http://au.archive.ubuntu.com precise/restricted i386 Packages
Hit http://au.archive.ubuntu.com precise/universe i386 Packages
Hit http://au.archive.ubuntu.com precise/multiverse i386 Packages
Hit http://au.archive.ubuntu.com precise/main TranslationIndex
Hit http://au.archive.ubuntu.com precise/multiverse TranslationIndex
Hit http://au.archive.ubuntu.com precise/restricted TranslationIndex
Hit http://au.archive.ubuntu.com precise/universe TranslationIndex
Hit http://au.archive.ubuntu.com precise-security/main Sources
Hit http://au.archive.ubuntu.com precise-security/restricted Sources
Hit http://au.archive.ubuntu.com precise-security/universe Sources
Hit http://au.archive.ubuntu.com precise-security/multiverse Sources
Hit http://au.archive.ubuntu.com precise-security/main i386 Packages
Hit http://au.archive.ubuntu.com precise-security/restricted i386 Packages
Hit http://au.archive.ubuntu.com precise-security/universe i386 Packages
Hit http://au.archive.ubuntu.com precise-security/multiverse i386 Packages
Hit http://au.archive.ubuntu.com precise-security/main TranslationIndex
Hit http://au.archive.ubuntu.com precise-security/multiverse TranslationIndex
Hit http://au.archive.ubuntu.com precise-security/restricted TranslationIndex
Hit http://au.archive.ubuntu.com precise-security/universe TranslationIndex
Get:3 http://extras.ubuntu.com precise Release.gpg [72 B]
Get:4 http://ppa.launchpad.net precise Release.gpg [316 B]
Get:5 http://ppa.launchpad.net precise Release.gpg [316 B]
Hit http://au.archive.ubuntu.com precise/main Translation-en_AU
Hit http://au.archive.ubuntu.com precise/main Translation-en
Hit http://au.archive.ubuntu.com precise/multiverse Translation-en_AU
Hit http://au.archive.ubuntu.com precise/multiverse Translation-en
Hit http://au.archive.ubuntu.com precise/restricted Translation-en_AU
Hit http://au.archive.ubuntu.com precise/restricted Translation-en
Hit http://au.archive.ubuntu.com precise/universe Translation-en
Hit http://au.archive.ubuntu.com precise-security/main Translation-en
Hit http://au.archive.ubuntu.com precise-security/multiverse Translation-en
Hit http://au.archive.ubuntu.com precise-security/restricted Translation-en
Hit http://au.archive.ubuntu.com precise-security/universe Translation-en
Hit http://extras.ubuntu.com precise Release
Hit http://ppa.launchpad.net precise Release
Ign http://ppa.launchpad.net precise Release
Hit http://ppa.launchpad.net precise Release
Hit http://extras.ubuntu.com precise/main Sources
Ign http://ppa.launchpad.net precise/main Sources/DiffIndex
Ign http://ppa.launchpad.net precise/main i386 Packages/DiffIndex
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://extras.ubuntu.com precise/main i386 Packages
Ign http://extras.ubuntu.com precise/main TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main i386 Packages
Get:6 ftp://ftp.videolan.org ./ Release.gpg [287 B]
Hit ftp://ftp.videolan.org ./ Release
Ign ftp://ftp.videolan.org ./ Release
Ign http://extras.ubuntu.com precise/main Translation-en_AU
Ign http://extras.ubuntu.com precise/main Translation-en
Get:7 ftp://ftp.videolan.org ./ Packages/DiffIndex
Ign http://ppa.launchpad.net precise/main Translation-en_AU
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_AU
Ign ftp://ftp.videolan.org ./ Packages/DiffIndex
Ign http://ppa.launchpad.net precise/main Translation-en
Get:8 ftp://ftp.videolan.org ./ Translation-en_AU
Get:9 ftp://ftp.videolan.org ./ Translation-en
Hit ftp://ftp.videolan.org ./ Packages
Get:10 ftp://ftp.videolan.org ./ Translation-en_AU
Get:11 ftp://ftp.videolan.org ./ Translation-en
Get:12 ftp://ftp.videolan.org ./ Translation-en_AU
Get:13 ftp://ftp.videolan.org ./ Translation-en_AU
Get:14 ftp://ftp.videolan.org ./ Translation-en
Get:15 ftp://ftp.videolan.org ./ Translation-en_AU
Err ftp://ftp.videolan.org ./ Translation-en_AU
Could not connect passive socket.
Get:16 ftp://ftp.videolan.org ./ Translation-en
Ign ftp://ftp.videolan.org ./ Translation-en
Fetched 1,387 B in 5min 0s (4 B/s)
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7375AF8BDA39203D
W: GPG error: ftp://ftp.videolan.org ./ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6BCA5E4DB84288D9
W: Failed to fetch ftp://ftp.videolan.org/pub/debian/stable/./en_AU Could not connect passive socket.

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