Here is the description of my installed packages (which are probably involved), where this bug appeared.
$ sudo dpkg -l pmount Password: Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-==================-==================-==================================================== ii pmount 0.9.11-1 mount removable devices as normal user $ sudo dpkg -l hal Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-==================-==================-==================================================== ii hal 0.5.7-1ubuntu18 Hardware Abstraction Layer $ sudo dpkg -l dbus Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-==================-==================-==================================================== ii dbus 0.60-6ubuntu8 simple interprocess messaging system $ sudo dpkg -l hal-device-manager Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-==================-==================-==================================================== ii hal-device-manager 0.5.7-1ubuntu18 Hardware Abstraction Layer user interface -- USB mount failed in Xubuntu 6.06 LTS https://launchpad.net/bugs/49655 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs