Public bug reported:

Binary package hint: uml-utilities

uml-utilites is somewhat broken when used with udev. It sets permissions
on /dev/net/tun with a hack in /etc/network/if-pre-up.d/uml-utilities
that reads (commented out as I have already applied the proposed fix to
my running system):

#
# why the hell does this need to be done?
#
#chown root:uml-net /dev/net/tun
#chmod 660 /dev/net/tun

This has the inconveniece that as soon as udev loads or unloads a
different module (say for a USB flash key) tun permissions immediately
return to root:root

The solution is to replace that hack with a udev rules file with the
proper permissions:

#/etc/udev/rules.d/40-uml-utilities.rules
KERNEL=="tun",                          GROUP="uml-net", MODE="0660"

** Affects: uml-utilities (Ubuntu)
     Importance: Undecided
         Status: New

-- 
uml-utilities conflicts with udev
https://bugs.launchpad.net/bugs/129254
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