RT output profiles and soft-proofing

hi Morgan, I had no idea it might be so easy… do I really need to do just the two 16.10 commands?, i.e.
sudo apt-get update
then
sudo apt-get install etc. etc.

Would I need to first remove my current RT which is done via “ppa:dhor/myway” ?

I tried ImageMagick but on my PC it’s a badly-behaved app prone to crashing, and I’ve removed it. (it also seemed to be installed twice with the same name). Do you know of any other apps, please, which could convert to a printer profile (in case I can’t get the Dev build installed) ?
@Elle, you know loads of apps! Do you know any to do the conversion please? (You mentioned Gimp but I found the associated issues made it too daunting for me)