Clipboard stops working. Unable to restart VBox Additions

[amr]

I'm running Ubuntu 12.10 (guest) on Windows 7 (host). Every now and then, clipboard sharing (e.g. from host to guest) stops working. The only way to get it back to work is to restart the machine.

Before I file a ticket, I was wondering if anyone has had this problem before and if there is a recommended course of action. I have seen old tickets that have been closed (and presumably fixed) in relation to this problem.

I have also read online that restarting the VirtualBox Additions service could bring clipboard sharing back, but if I try to do so, I get an error message:

Code: Select all

$ /etc/init.d/vboxadd restart
Stopping VirtualBox Additions ... fail!
(Cannot umount vboxsf folders)

I have not specified any shared folders (I haven't even touched that feature since I installed VirbualBox), so I am not sure what may be causing this.

I can post the log files if that helps, but there are five log files (VBox.log, VBox.log.1, VBox.log.2, VBox.log.3, and VBox.log.4), and if I paste them all (411864 chars) it would exceed the allowed number of characters (60000 chars).

Does anyone have any suggestions?

[noteirak]

Attach the log files as a zip file to this post, this way we can download the file directly and check if something comes up

[mpack]

We don't need the log file from the last five sessions, we only need the latest one (vbox.log), or at least the one corresponding to the problem session.