I am also seeing this problem and it is very annoying. To clarify what others have said, I found that the workaround is:
$ sudo su - $ apt-get upgrade I found that 'sudo apt-get upgrade' doesn't work as it does not seem to pick up the http_proxy setting. Further, if I have accidentally tried to upgrade without switching to root, I have to remove the flashplugin- installer package and then reinstall it: $ sudo su - $ apt-get remove flashplugin-installer $ apt-get install flashplugin-installer -- package flashplugin-installer 10.0.22.87ubuntu2 failed to install/upgrade over proxy https://bugs.launchpad.net/bugs/362970 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
