Ubuntu PPA not updating
I'm using Ubuntu and have previously had my sage automatically update to the latest version. It's now stalled at 5.13 and didn't upgrade to 6.0 or 6.1.
I followed the instructions on http://sagemath.org/download-linux.html which says to give these commands.
apt-add-repository -y ppa:aims/sagemath apt-get update apt-get install sagemath-upstream-binary
This used to work but has stopped. Any ideas?