[Bug 1052323] [NEW] [regression][lucid] system frequently reboots after update in august 2012, path via rtkit and AptDaemon

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My two lucid (LTS- long term support) systems now display recent reboots.
I suspect the  kernel upgrade that was released end august 2012, but I an not sure.
During the time of the reboot, the system was doing calculations in and atd/cron job.
The signature of the reboots is as follows:
1) rtkit-daemon starts logging that some processes become RT.
2) after about 1 minute AptDaemon: INFO: Initializing daemon
3) after about 5 minutes  AptDaemon: INFO: Quiting due to inactivity
4) then, after about 30 - 60 minutes, I see the system reboot.

This is a regression: I did not see this before.
I have worked around by booting with acpi=off

 uname -a
2.6.32-42-generic-pae #96-Ubuntu SMP Wed Aug 15 19:12:17 UTC 2012 i686 GNU/Linux


logging from daemon.log:

Sep  2 18:59:11 his10 rtkit-daemon[1876]: Sucessfully made thread 8119 of process 8119 (n/a) owned by '1002' high priority at nice level -11.
Sep  2 18:59:11 his10 rtkit-daemon[1876]: Supervising 12 threads of 4 processes of 4 users.
Sep  2 18:59:15 his10 rtkit-daemon[1876]: Sucessfully made thread 8134 of process 8119 (n/a) owned by '1002' RT at priority 5.
Sep  2 18:59:15 his10 rtkit-daemon[1876]: Supervising 13 threads of 4 processes of 4 users.
Sep  2 18:59:15 his10 rtkit-daemon[1876]: Sucessfully made thread 8135 of process 8119 (n/a) owned by '1002' RT at priority 5.
Sep  2 18:59:15 his10 rtkit-daemon[1876]: Supervising 14 threads of 4 processes of 4 users.
Sep  2 18:59:16 his10 rtkit-daemon[1876]: Sucessfully made thread 8137 of process 8119 (n/a) owned by '1002' RT at priority 5.
Sep  2 18:59:16 his10 rtkit-daemon[1876]: Supervising 15 threads of 4 processes of 4 users.
Sep  2 18:59:16 his10 rtkit-daemon[1876]: Sucessfully made thread 8138 of process 8138 (n/a) owned by '1002' high priority at nice level -11.
Sep  2 18:59:16 his10 rtkit-daemon[1876]: Supervising 16 threads of 5 processes of 4 users.
Sep  2 19:00:14 his10 AptDaemon: INFO: Initializing daemon
Sep  2 19:05:15 his10 AptDaemon: INFO: Quiting due to inactivity
Sep  2 19:05:15 his10 AptDaemon: INFO: Shutdown was requested

** Affects: aptdaemon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: lucid regression
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[regression][lucid] system frequently reboots after update in august 2012, path via rtkit and AptDaemon 
https://bugs.launchpad.net/bugs/1052323
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