I had Ubuntu 12.04 and did a dual boot with 14.04 in case something went wrong with upgrading. It seems to be working fine with either version, so to remove 12.04 leaving just 14.04 should I remove the partition containing 12.04 and run upgrade-grub before rebooting? Or is there a better way?
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Make sure your boot partition isn't the one containing the Ubuntu 12.04 boot. If it is, it's better to move the boot partition to another one.
After that (or if you are sure it isn't the same partition), you can normally delete the partition (or using GParted which I recommend) and assign the free space to whatever you'd like.
Try doing those on your installed Ubuntu 14.04 (except moving the /boot because it's mounted), because that way GParted won't let you mess up with Ubuntu 14.04 mounted partitions.
Then you can run repair-boot to delete and update your grub2 settings.
