updates don't install

[Pedro]

When I try to install updates the following error occurs:
E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.
E: _cache->open() failed, please report.

i try doing what's writen and i get:
dpkg: ../../src/packages.c:221: process_queue: Assertion `dependtry <= 4' failed.

[Martin Kossick (hacktick)]

Assigned "Nobody", before it was Pedro himself.

[Martin Kossick (hacktick)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs.