I don't see anything obviously wrong with your sources.list. Can you try
to run sudo dpkg --clear-avail in a terminal, and then run sudo apt-get
update, and then try installing packages? See
https://help.ubuntu.com/community/UsingTheTerminal if you need help with
the terminal.
** Changed in: apt (Ubuntu)
Status: New => Incomplete
--
synaptic fails
https://bugs.launchpad.net/bugs/546767
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