This is a python-gobject-2 bug introduced by the fix in https://bugs.launchpad.net/ubuntu/+source/pygobject-2/+bug/1129309
It's only in combination with QL 2.5 which isn't in Ubuntu. 2.5.1 has a workaround and will be released soon. Possible workarround: use the QL unstable PPA.
This is a python-gobject-2 bug introduced by the fix in https:/ /bugs.launchpad .net/ubuntu/ +source/ pygobject- 2/+bug/ 1129309
It's only in combination with QL 2.5 which isn't in Ubuntu. 2.5.1 has a workaround and will be released soon.
Possible workarround: use the QL unstable PPA.