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For all those who installed aptitude to easily search through apt on ubuntu 11+, upon upgrading to 11.10 I am now receiving this error.

[ ERR] Reading state information
E: Could not open lock file /var/lock/aptitude - open (2: No such file or directory)
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up vote 5 down vote accepted

To fix this:

sudo mkdir /run/lock

Aptitude should now run without issue.

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/var/lock is just a symlink to /run/lock edit the above solution to fit your needs but this should work for 99% of the users. – AndrewPK Apr 10 '12 at 15:55
I did answer my own question - because I knew the answer and wanted it to be available for anyone in the community who might not. – AndrewPK May 14 '13 at 14:00

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