Bitmask v.0.10.x seems to not work on Ubuntu 17.10 (Artful)
It's possible to login to Bitmask account and start VPN, but then there's no connection to the internet. Tried the repo version and the bundle as well.
Maybe this message would be of some help:
"No such interface 'org.freedesktop.DBus.Properties' on object at path /org/freedesktop/NetworkManager/ActiveConnection/4"