Comment 4 for bug 537596

After asking about this on a mailing list, Martin Pitt kindly informed me that ACL is indeed used in Ubuntu and thus the +-signs. The ACL is set by udev using the ruleset in /lib/udev/rules.d/70-acl.rules

The rationale to use ACL in Ubuntu is that with it the system can control that e.g. inserted USB-drives can be accessed by the user who's console is currently active in stead of any user who is logged in.

I tried toggling consoles with Ctrl+Alt+F1-8, but it didn't help.

Restarting udev just says:
$ restart udev
restart: Rejected send message, 1 matched rules; type="method_call", sender=":1.51" (uid=1000 pid=2038 comm="restart) interface="com.ubuntu.Upstart0_6.Job" member="Restart" error name="(unset)" requested_reply=0 destination="com.ubuntu.Upstart" (uid=0 pid=1 comm="/sbin/init"))

udev logs, ConsoleKit logs etc. does not show anything suspicious.

However in syslog I found lines like:
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Could not determine active console
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 4 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 5 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 7 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 9 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 11 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 13 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 15 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 3 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 28 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 48 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 6 activation: Invalid argument
Mar 17 21:40:42 shuttle console-kit-daemon[874]: WARNING: Error waiting for native console 54 activation: Invalid argument

Might they be related? Any tips on how to continue debugging this?