Kubuntu 12.04 to 14.04 upgrade error

[Dave]

I am trying to upgrade from 12.04 to 14.04. I followed the instructions on the https://help.ubuntu.com/community/Tr...buntu/12.04LTS page. In a terminal window I ran the command

kubuntu-devel-release-upgrade

and got

Get:1 Upgrade tool signature [198 B]
Get:2 Upgrade tool [1,148 kB]
Fetched 1,148 kB in 0s (0 B/s)
authenticate 'trusty.tar.gz' against 'trusty.tar.gz.gpg'
extracting 'trusty.tar.gz'
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 also ran the sudo update-manager -d command mentioned at the bottom of the above mentioned page in a terminal windw and got

sudo: update-manager: command not found

Can anyone help? Thanks in advance.

[Shaika-Dzari]

Did you remount /tmp as exec like the message was saying ?

sudo mount -o remount,exec /tmp