If you dont think you have anything open, it is most likley the synaptic automatic uploader, there should an icon in the upper or lower right corner for it. Somethimes it gets weird and will lock the file even though you havent opened it, something weird just happened with it as it was checking for updates, as its not supposed to lock anything when its just sitting in the bar letting you know you have updates available. Only 1 instance of an update can occur at once as they use the same Apt files. Apt-Get, Aptitude and Synaptic all share them.
Disable it (man I forget how sorry, I use fluxbox so I dont even have to concern myself with that) and just use aptitude for updates, using synaptic can get you into trouble, it tries to force all the packages that would normally be held back by synaptic cause they usually arent finished yet and have dependencies that arent compatible (like for instance ive had synaptic remove all of gnome cause i wasnt paying attention, some package had a dependency for a new version of a file that Gnome depended on also... so it removed gnome to resolve the issue hahahaha.)
Last edited by Zaskar; 11-10-2007 at 02:21 PM.