Public bug reported:

Binary package hint: update-manager

This is on a friend's mom's computer.   When running update-manager it
says:

E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct 
the problem.
E: _cache->open() failed, please report.

There are several reports of this already in bugs, generally all closed
as invalid.  (eg #121930, #106690, #207684, #310735. #319926).

While the message may be meaningful to us technical folk, it is complete
gibberish to normal users.  It also neglects to mention that the command
has to be run in a terminal and that it has to be prefixed by sudo (you
can see the confusion in those other reports).

But even then this is silly.  If the software wants the issue reported
then it should report it itself.  And since it knows exactly what
command should be run to fix things, why not just run the command
automatically?

And why is the situation even arising in the first place?  The update
system should handle it all gracefully in the first place.  My best
guess as to what happened is that the machine is set to automatically
download and install updates.  It was probably doing that when it was
shutdown.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
_cache->open() failed, please report.
https://bugs.launchpad.net/bugs/320222
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