RedSingularity, please note that this error (as far as I'm aware) only
occurs when the home directory is being served from AFS. This scenario
breaks common assumptions held by many programs (that the homedir is
always accessible/writable) and is thus more likely than not the
ultimate cause of this bug.
You may be able to simulate the effect of expired Kerberos/AFS
authentication by logging in, allowing the desktop to load and settle,
and then invoking "chmod 000 $HOME". (chown'ing the directory as root
may help, too, to prevent user programs from chmod'ing things back.)
This only represents a partial simulation, however, as under AFS only
some processes may be unable to access a given directory (depending on
the process group that they are in). If there are any update-manager
processes that do not run in the same process group as the rest of the
desktop, yet expect to access the homedir, this may be an issue.
The fix needed here, I suspect, is something that doesn't involve the
filesystem at all. For example, setting an X property on the root to
ensure that only one instance of the window exists.
** Changed in: update-manager (Ubuntu)
Status: Invalid => New
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https://bugs.launchpad.net/bugs/785296
Title:
Multiple instances of "Ubuntu XX.YY Upgrade Available" (check-new-
release-gtk) dialog
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