Could you please run (in a terminal) when this happens:
$ ps afx > /tmp/ps.txt
and attach the file ps.txt ?
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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E: Could not get lock /var/cache/apt/archives/lock - open (11 Resource
temporarily unavailable) E: Unable to lock the download directory
https://bugs.launchpad.net/bugs/427029
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