This was confirmed on the forum too:
http://ubuntuforums.org/showthread.php?t=401148
And on the opera forums:
http://my.opera.com/community/forums/topic.dml?id=183923
They say it's because of the libx11-6's upgrade
** Changed in: libx11 (Ubuntu)
Sourcepackagename: None => libx11
Status: Unconfirmed => Confirmed
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Opera failed after update - date 04/04/07
https://bugs.launchpad.net/bugs/102851
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