Ubuntu - not fit for purpose
Ah, kool - Ubuntu. And of course, it never has problems. It doesn't drop printer access when upgrading from 'release' to 'release' - or muck up Samba, or cross-platform file sharing, or impose network traffic limits, or drop innocent users into a morass of vi/nano instructions.
And such a support community, too! You never come across arrogant self satisfied responders who delight in obfuscation by referring noobs to 'just sudo this...'
Or provides such wonders as Gimp, which almost, but just not quite does anything you want.
There is a reason business does not use Ubuntu - it's not fit for purpose. And the idea of introducing it into a school environment with the expectation that it will /reduce/ IT frustration and cost is simply risible.
I'll skip mentioning the thought that your attitude to a ICT student seeking a work placement in an environment where thay might learn about Linux pretty much sums up everything one needs to know about the attitude of Linux proponents I have come across.