Synaptic Manager/Update manager not working

[johnjoy]

i'm in a lan, and i need to set a proxy to access the net. i have set it on my Synaptics, Networking tools, Networks, and browser. i'm able to visit all sites in my browser.

i have set the source server as ftp.iitm.ac.in (india). but when i try to update files, it says Could not resolve host iitb@netmon.iitb.ac.in.

the etc/apt/Source.list file says

deb cdrom:[Ubuntu 9.04 _Jaunty Jackalope_ - Release i386 (20090420.1)]/ jaunty main restricted
deb-src http://ftp.iitm.ac.in/ubuntu/ jaunty main restricted #Added by software-properties
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://ftp.iitm.ac.in/ubuntu/ jaunty main restricted
deb-src http://ftp.iitm.ac.in/ubuntu/ jaunty multiverse universe #Added by software-properties

## Major bug fix updates produced after the final release of the
## distribution.
deb http://ftp.iitm.ac.in/ubuntu/ jaunty-updates main restricted
deb-src http://ftp.iitm.ac.in/ubuntu/ jaunty-updates restricted main multiverse universe #Added by software-properties

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://ftp.iitm.ac.in/ubuntu/ jaunty universe
deb http://ftp.iitm.ac.in/ubuntu/ jaunty-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ftp.iitm.ac.in/ubuntu/ jaunty multiverse
deb http://ftp.iitm.ac.in/ubuntu/ jaunty-updates multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://in.archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse
# deb-src http://in.archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu jaunty partner
# deb-src http://archive.canonical.com/ubuntu jaunty partner

deb http://ftp.iitm.ac.in/ubuntu/ jaunty-security main restricted
deb-src http://ftp.iitm.ac.in/ubuntu/ jaunty-security restricted main multiverse universe #Added by software-properties
deb http://ftp.iitm.ac.in/ubuntu/ jaunty-security universe
deb http://ftp.iitm.ac.in/ubuntu/ jaunty-security multiverse
deb http://packages.medibuntu.org/ jaunty free non-free
deb-src http://packages.medibuntu.org/ jaunty free non-free
deb http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main

i wanted to install strong dc++ and some video player. please help me run the synaptics.

Thank You

[realzippy]

...does "apt-get" work?
Open a terminal and type:

sudo apt-get update

if it does,it might be a gksudo synaptic problem as referred here:

http://www.linuxquestions.org/questions/ubuntu-63/problems-with-apt-get-synaptic-and-proxy-454026/

[bulls_eye]

hi,
have you tried proxy settings in the terminal?
I had the same problem once and setting proxy through the terinal did the trick for me...

just open the terminal and type

export http_proxy=http://username:password@proxyserver.net:port/
export https_proxy=http://username:password@proxyserver.net:port/
export ftp_proxy=http://username:password@proxyserver.net:port/

hope this works for you too...