It seems that there is a persistent network error on Travis CI:
"Failed to download key at https://ubuntu.bigbluebutton.org/repo/bigbluebutton.asc: Request failed: <urlopen error [Errno -3] Temporary failure in name resolution>"
The network issue can be reproduced persistently even after a couple times restarting the build.
Any ideas on what could be wrong?
The complete build error can be found here: