[Mailman-Users] Web interface stopped working after ubuntu update

[Nick Wyman]

> > Why this would start occurring following an OS update, I
> > don't know. Possibly it is some apparmor config or something similar.
> 
> Or SELinux became enabled?
> 

I've been able to eliminate apparmor (disabled) and selinux (not installed).  

The setregid call simply returns -1.  What is odd is that it is the wrapper is attempting to set the GID to the current value.  Here is some debugging output:

check_caller: start
check_caller: end
run_script: start
effective GID 38
real GID 38
setregid returned -1
errno: 1 Operation not permitted