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I updated the packages on a debian server a while back using aptitude but I cant remember the exact date when that happened. Is there a way to determine this?

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Duplicate of… – Hamish Downer May 18 '12 at 13:02
up vote 2 down vote accepted

Apt, aptitude and dpkg all keep logs in /var/log/apt/, /var/log/aptitude and /var/log/dpkg.log respectively. They rotate away after a while (6 months for apt and aptitude and 1 year for dpkg by default on Debian lenny).

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