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There is a known behavior of anacron not to run when the laptop is running on batteries. Is there any way to stop this behavior and run anacron whatever the power state?

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=152402

http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg560900.html

https://bugs.launchpad.net/ubuntu/+source/anacron/+bug/36816

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Are you sure it's up to anacron ? cron.daily/apt, cron.daily/mlocate and cron.daily/apt-xapian-index do call /usr/bin/on_ac_power explicitly to check whether the script is being run on a battery. You could probably just comment these conditions within those scripts as a solution. –  user40613 Jan 9 '12 at 21:28
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up vote 1 down vote accepted

I found how to do this and summarized it in my blogpost

http://opensourceresearchtips.blogspot.com/2012/01/linux-anacron-tips.html

To change this behavior of anacron do the following:

 sudo gedit /usr/lib/pm-utils/power.d/anacron

and change to

case $1 in
    false)
 start -q anacron || :
 ;;
    true)
 start -q anacron || :
 ;;
esac
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