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I am using Xubuntu 11.10 on old laptop with Pentium M and 1GB RAM. Please tell me, how to clear ureadahead cache, so I can build an "index" of files again, I would like to improve my system boot time, which takes about 1 minute.

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You probably mean ureadahead.

If so, remove any pack files in the /var/lib/ureadahead directory.

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Exactly! I was wrong, I mean ureadahead of course. Sorry about that, and thanks for solution! –  pioruns Nov 13 '11 at 13:33
    
Besides debugfs, I've home.pack and pack in /var/lib/ureadahead. Did you mean "any pack files" was *pack? Or *.pack? –  BornToCode Jan 21 at 9:45
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