First, let me say that I'm doing the following in sudo -s mode, so the fact that I'm leaving out sudo isn't the problem.
I tried to run do-release-upgrade, but it says, "Can not run the upgrade. This usually is caused by a system where /tmp is mounted noexec. Please remount without noexec and run the upgrade again." The Ubuntu forums say to edit /tmp in /etc/fstab, but that file says:
This file is not used on vserver guests.
Check /etc/vservers/ps461825/fstab on iad1-vshost47
I tried mount -o remount exec -t tmpfs /tmp, but it told me that permission was denied. I tried to unmount /tmp, but it told me that access was denied.
How can I upgrade my Ubuntu release?