while running the upgrade a pop-up window appeared with the message

"The upgrade has aborted. Your system could be in an unusable state. A recovery will run now (dpkg --configure -a)."

After clicking "Ok", I was waiting for >30 min but nothing happens, the distribution upgrade is just stuck, and I can't figure out what exactly the error is (see screenshot).

Distribution Upgrade -- Screenshot

I found some similar problems e.g. here or here but at least there was an error traceback, which I don't have.

Should I abort the distribution upgrade, then try manually fixing the packages and then reboot?

Thanks in advance!

  • o.k., apparently the distribution upgrade worked after all... after running "dpkg --configure -a" and "sudo apt-get install -f", I rebooted and have 15.10 working... a bug? – Juri Romazanov Apr 8 '16 at 9:51

Try clearing the cache with -

sudo apt-get clean

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