Accelerate Ubuntu upgrades with an ISO

This is a fairly useful (and simple, but not very innovative) trick for older machines using Ubuntu, when your network connection might be weak, or when you have a lot of software to install and don’t want to wait on an old CDROM.

You can mount an ISO — such as the alternate or desktop Ubuntu ISOs — to the /media/cdrom0 mountpoint, and use that as a kind of on-disk stash for system files and dependencies. Here’s what I mean.