I have Quantal (upgraded recently), and can confirm the problem.
In fact the problem are non-english characters. When you upgrade,
upgrade tool would disable old sources and add commnet they are
disabled. In slovenian language comment is like: "onemogočeno ob
nadgradnji na quantal". It contains slovenian character "č".
When I changed it to "onemogoceno ob nadgradnji na quantal" ("c" instead
of "č"), everything works fine.
It is a nasty bug for all who don't know how to edit sources.list from
commandline, because you can not enable, remove or edit disabled sources
from GUI tool.
I think solution should be quite trivial, so it would be great if
developers could solve that with higher priority.
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https://bugs.launchpad.net/bugs/1069019
Title:
[software-properties-gtk] can not delete, enable or modify any
software source with non-ASCII characters in the comment
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