I had the same "cannot import name SIGNATURE_HMAC" error as papachan
causing sso-login and thus also software-center on launch.
I resolved it by reinstalling the oauthlib package via pip.
sudo pip install --upgrade oauthlib
--
You received this bug notification because you are a member of Ubunt
I had this same problem on my gentoo machine
I don't have it anymore if I start Konsole with "Konsole --notransparency"
nvidia 270.41.06
xorg 1.10.1.901
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/7
