Karmic since two weeks (new installation). First time it occured after an update (via Synaptic) and reboot today. Message about ECC (Error Correction Code) was in the logs all along, but no Apport bug report till this moment. System runs still stable. History: Since the message occured in logfiles I did a search on this and acknowledged the GUI system monitor showed 999,9 MB RAM instead of 1024 as before in Hardy. My BIOS also isn't capable of ECC. (Details of sys specs are in the uploaded Apport report) Related message in logfile was: Phoenix BIOS detected: BIOS may corrupt low RAM, working around it. $free total used free shared buffers cached Mem: 1023932 980728 43204 0 59672 399912 -/+ buffers/cache: 521144 502788 Swap: 3478032 0 3478032 $free -m total used free shared buffers cached Mem: 999 957 42 0 58 390 -/+ buffers/cache: 508 490 Swap: 3396 0 3396 As suggested here I ran MEM Test, passed without any errors. http://ubuntuforums.org/archive/index.php/t-1084863.html Only Synaptic was open during update. Commit Log for Fri Oct 16 19:49:53 2009 apport (1.9.3-0ubuntu1) to 1.9.3-0ubuntu2 apport-gtk (1.9.3-0ubuntu1) to 1.9.3-0ubuntu2 apt (0.7.23.1ubuntu1) to 0.7.23.1ubuntu2 apt-transport-https (0.7.23.1ubuntu1) to 0.7.23.1ubuntu2 apt-utils (0.7.23.1ubuntu1) to 0.7.23.1ubuntu2 compiz (1:0.8.3+git20091005-0ubuntu5) to 1:0.8.4-0ubuntu1 compiz-core (1:0.8.3+git20091005-0ubuntu5) to 1:0.8.4-0ubuntu1 compiz-fusion-plugins-extra (0.8.3+git20090914-0ubuntu1) to 0.8.4-0ubuntu1 compiz-fusion-plugins-main (0.8.3+git20091006-0ubuntu1) to 0.8.4-0ubuntu1 compiz-gnome (1:0.8.3+git20091005-0ubuntu5) to 1:0.8.4-0ubuntu1 compiz-plugins (1:0.8.3+git20091005-0ubuntu5) to 1:0.8.4-0ubuntu1 compiz-wrapper (1:0.8.3+git20091005-0ubuntu5) to 1:0.8.4-0ubuntu1 compizconfig-backend-gconf (0.8.2-0ubuntu2) to 0.8.4-0ubuntu1 cups (1.4.1-4) to 1.4.1-5ubuntu2 cups-bsd (1.4.1-4) to 1.4.1-5ubuntu2 cups-client (1.4.1-4) to 1.4.1-5ubuntu2 cups-common (1.4.1-4) to 1.4.1-5ubuntu2 devicekit-power (011-1) to 011-1ubuntu1 evince (2.28.0-0ubuntu4) to 2.28.0-0ubuntu5 gnome-power-manager (2.28.0-0ubuntu6) to 2.28.0-0ubuntu7 gnome-settings-daemon (2.28.0-0ubuntu3) to 2.28.0-0ubuntu5 libcompizconfig0 (0.8.3+git20090901-0ubuntu1) to 0.8.4-0ubuntu1 libcups2 (1.4.1-4) to 1.4.1-5ubuntu2 libcupscgi1 (1.4.1-4) to 1.4.1-5ubuntu2 libcupsdriver1 (1.4.1-4) to 1.4.1-5ubuntu2 libcupsimage2 (1.4.1-4) to 1.4.1-5ubuntu2 libcupsmime1 (1.4.1-4) to 1.4.1-5ubuntu2 libcupsppdc1 (1.4.1-4) to 1.4.1-5ubuntu2 libdecoration0 (1:0.8.3+git20091005-0ubuntu5) to 1:0.8.4-0ubuntu1 libdevkit-power-gobject1 (011-1) to 011-1ubuntu1 libevdocument1 (2.28.0-0ubuntu4) to 2.28.0-0ubuntu5 libevview1 (2.28.0-0ubuntu4) to 2.28.0-0ubuntu5 libgudev-1.0-0 (1:147~-5) to 1:147~-6 libpolkit-agent-1-0 (0.94-1) to 0.94-1ubuntu1 libpolkit-backend-1-0 (0.94-1) to 0.94-1ubuntu1 libpolkit-gobject-1-0 (0.94-1) to 0.94-1ubuntu1 libudev0 (147~-5) to 147~-6 nvidia-173-modaliases (173.14.20-0ubuntu2) to 173.14.20-0ubuntu3 nvidia-96-modaliases (96.43.13-0ubuntu3) to 96.43.13-0ubuntu4 openoffice.org-thesaurus-de (20080808-1) to 20080808-1ubuntu2 openoffice.org-thesaurus-de-ch (20080808-1) to 20080808-1ubuntu2 policykit-1 (0.94-1) to 0.94-1ubuntu1 python-apport (1.9.3-0ubuntu1) to 1.9.3-0ubuntu2 python-cupshelpers (1.1.12+git20090826-0ubuntu6) to 1.1.12+git20090826-0ubuntu7 python-problem-report (1.9.3-0ubuntu1) to 1.9.3-0ubuntu2 software-center (0.5.2) to 1.0 synaptic (0.62.7ubuntu5) to 0.62.7ubuntu6 system-config-printer-common (1.1.12+git20090826-0ubuntu6) to 1.1.12+git20090826-0ubuntu7 system-config-printer-gnome (1.1.12+git20090826-0ubuntu6) to 1.1.12+git20090826-0ubuntu7 system-config-printer-udev (1.1.12+git20090826-0ubuntu6) to 1.1.12+git20090826-0ubuntu7 ubuntu-wallpapers (0.29) to 0.30 ubuntu-xsplash-artwork (0.8.3-0ubuntu2) to 0.8.4-0ubuntu1 udev (147~-5) to 147~-6 update-manager (1:0.126.3) to 1:0.126.4 update-manager-core (1:0.126.3) to 1:0.126.4 update-notifier (0.89) to 0.90 update-notifier-common (0.89) to 0.90 upstart (0.6.3-9) to 0.6.3-10 xsplash (0.8.3-0ubuntu2) to 0.8.4-0ubuntu1 Hope this helps.