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?
