Thanks for reporting. Please run:
apport-collect 707392
To gather system info. Also attach your sources.list: (Located on
desktop after running following command.)
cat /etc/apt/sources.list > ~/Desktop/Sources
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/707392
Title:
Not possible to upgrade untrusted packages
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