My PC runs Linux Mint 18.2 xfce, and has done so without a hitch for about 4-5 months or so. Today, I rebooted the PC, and on boot it displayed the Ubuntu splash saying
Ubuntu 18.2, rather than the Mint splash I was expecting. I'm aware that
Ubuntu 18.2 doesn't actually exist, which makes this even more confusing.
The log-in screen looks the same as usual (looks like xfce Mint is supposed to look), but upon logging in, I found myself faced with a desktop that looks like Ubuntu/Unity. As far as I can tell by just clicking around, the system seems to be fully functional, and all my files and folders are in their normal locations. It's just that everything looks like Ubuntu.
I've never seen this before, and apart from 1 thread on the Linux Mint forums from 2014, which ended in the user reinstalling Mint, I've not been able to find anyone with this problem. As a result, don't know how to fix this.
I do not have the option to choose a desktop on the login screen. I rebooted, verified I'm booting from the correct partition, yet the issue persists.
This system is a dual boot with Windows 10, but I've not set up the bootloader to support that. i.e. I have to tap F8 during boot if I want to boot into Windows.
Things I did prior to reboot which might be related:
Set up Ubuntu server 16.04 in a virtualbox. The ISO for this install resides on my normal system, where it has been for a while, but I'm positive I installed it in the Virtual Machine. There's no chance I accidentally installed it on my normal system, because I was watching YouTube videos while the VM was busy installing Ubuntu. I also verified that Ubuntu Server has been correctly installed to the VM, and it would be highly unlikely if not impossible for it to be accidentally installed to 2 partitions. Also, the Ubuntu/Unity desktop environment does not come with Ubuntu server, as that is terminal-based.
I installed RVM package manager, and got an error for missing dependency
g++. I tried to install g++ using
apt, but got more missing dependencies.
This is when I decided to reboot the system, to see if that would work.
Would the issue be resolved by removing/purging RVM again? I'm a bit hesitant, as I don't want to completely bork the system.
What I think might have happened is that somehow a unity desktop was installed (or activated) during the attempted install of RVM, or during a different activity (although I wouldn't know which activity could have caused that; I didn't do anything unusual as far as I can remember). I am, however, unsure if that's even possible, let alone how to resolve that.