This just bit me as well. It's this bug:
https://bugs.launchpad.net/ubuntu/+source/python-defaults/+bug/989856
Reinstalling the virtual environment over the old one seems to work
fine, just run the same command you used to build it the first time.
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also have same bug...
10.04 x64
** Also affects: apturl
Importance: Undecided
Status: New
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adobe-flashplugin is virtual error when installing flash from Adobe site.
https://bugs.launchpad.net/bugs/554449
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