Comment 2 for bug 293040

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LukeKendall (luke-zeta) wrote : Re: package update-manager 1:0.87.30 failed to install/upgrade: ErrorMessage: SystemError in cache.commit(): E:Sub-process /usr/bin/dpkg returned an error code (1)

Note also that I reported one other problem - that when samba asked me to confirm whether to keep my own smb.conf file, I chose the option to run a shell, and the update manager seemed to block, and no shell window that I could see was available to do my own diffs (note that a request for a side-by-side diff just resulted in a plain diff), and with the update-manager blocked, I had to find the bash that seemed relevant and kill it. When I did, update-manager came back to life and reported that the samba post install shell script had exited unexpectedly, but strangely, it also reported about 8 other packages failed, from winbind to wine to ubuntu-desktop (see the attached VarLogDistupgradeMainlog).

Oh, and while worried that the above failure meant that the upgrade was broken, I tried running a second one, but it couldn't acquire the lock. I plan to run it again when the dead-looking "Distribution Upgrade" window terminates.
Wish me luck.