I am experiencing the same effect and have added a screen shot at bug
998125
I performed some further investigation and it seems to me thet the error
appears especially when you click on the tick mark besides a header line
("Important security updates", "Recommended updates", etc.). Right
clicking on a tickmark and choosing select all or deselect all usually
did not trigger the error.
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https://bugs.launchpad.net/bugs/939705
Title:
update-manager doesn't correctly solve dependencies when unselecting
package
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