Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
The Aptitude package management system built into Debian, Ubuntu and other Debian-derived distributions is top quality and makes it really easy to get software from out there on to your machine from one convienient interface.
However, occassionally things go a bit strange - new software might not appear, old software might get stuck or if you’ve just added a new repository, you’ll need to flush the existing package list out to reload things anew.
Thankfully, it’s really really easy.