This problem can be caused by a messed-up file in /var/lib/apt/lists/.
The problem can be fixed by deleting all files in that directory, then
doing an apt-get update to regenerate them. So the error alert should
contain a button to try that for you.
** Changed in: update-manager (Ubuntu)
Assignee: (unassigned) => Matthew Paul Thomas (mpt)
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https://bugs.launchpad.net/bugs/1119247
Title:
"This requires installing packages from unauthenticated sources"
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