Comment 12 for bug 1034161

it looks like your system still is having an error when trying to use namespaces:

Command: ['sudo', 'ip', 'netns', 'exec', '3f68d8dc-b761-4cb9-a3bf-7e8c4a227da9', 'ip', 'link', 'set', 'tap4cffe1f8-07', 'up']
Exit code: 1
Stdout: ''
Stderr: 'seting the network namespace failed: Function not implemented\n'

Are you even able to run a basic command in that namespace, like

sudo ip netns exec 3f68d8dc-b761-4cb9-a3bf-7e8c4a227da9 ip addr list

?