I have Ubuntu 12.04 LTS and I tried to upgrade to Ubuntu 12.10. When I clicked in the Update Manager Upgrade a messagebox apeared:
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.
I tried to make /tmp executable in Terminal with the following command:
mount -o remount,exec /tmp /var/tmp
I pressed Enter and I got the following message from Terminal:
mount: only root can do that
What should I do now to make /tmp executable and upgrade the OS.