evolution itself was not installed (actually not upgraded from 11.04); I 
removed libgl1-mesa-glx
I also removed evolution-common/plugins but kept getting errors about 
dependence on libevolution when I tried to install.

I then tried to clean up with apt-get autoremove (a suggestion given in
the output of the earlier remove commands. Unfortunately the shutdown
entry in the menu did not work and when I turned the computer off the
Ubuntu graphical interface was not there.

Worse yet, I am not sure I can get to the console.  I tried to access
the Setup after powering. My monitor does not show anything before GRUB
- in particular no messages about booting alternatives, setup etc - so I
have to hit keys in the dark to stop the default boot to Ubuntu. I do
not know what I may have changed, but my monitor is now uniformly lit,
that is, I get a blank screen, which I get rid of by turning off the
computer.

I do not know why some packages were not upgraded properly from 11.04.
I'd appreciate any advice you may have, but I know it is no longer a
support issue.

Many thanks again,

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https://bugs.launchpad.net/bugs/884152

Title:
  Error: Marking the upgrade (from 11.04 to 11.10) - unresolved package
  dependencies

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