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Whenever update manager goes to check for updates - when done both manually and automatically - update manager crashes, and when I go to report the error, apport crashes too (apport also crashes when I try to report errors from other processes). Also, when I use apt from the command line to install programs, it stops while reading the package lists, and says: Segmentation fault (core dumped).
I copied the apt subsystem out of my other Ubuntu install - works perfectly now. I guess one of the package lists was corrupt, so that was causing the segmentation fault. Could probably have achieved the same results by deleting the package lists in /var/lib/apt/lists, but I was bored >_>

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closed as too localized by James Jul 12 '12 at 16:20

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Try with sudo dpkg --configure -a and post the output. – jasmines Jun 12 '12 at 9:57
Run the memory test from the Ubuntu Live CD/USB -- this reeks of bad RAM. – izx Jun 12 '12 at 11:44
If you have found a solution, you can post and answer and accept it--this is the norm here – hexafraction Jun 13 '12 at 20:24
I have the same problem. What do you mean exactly to do by copying "the apt subsystem"? Is that a directory? if so, where? – Rasoul Aug 31 '13 at 9:41