Comment 16 for bug 130636

Andreas I think it is happening for you as well. It should have requested the password the first time when you typed sudo bash & but it not.

for example
adrian@adrian-Latitude-E6420:~$ sudo gedit &
[1] 3429
adrian@adrian-Latitude-E6420:~$ sudo blah
[sudo] password for adrian:
sudo: blah: command not found

[1]+ Stopped sudo gedit
adrian@adrian-Latitude-E6420:~$ sudo gedit &
[2] 3433

The first time when I try to run gedit with the & it does not bring up the gedit window and did not ask me for my password
when i type sudo blah without the & it asks me for my password
now that i have authenticated for the blah command without the & i can type sudo gedit & and the gedit window opens.