Was having problems with Zorin 9.
Maybe my not knowing what I'm doing was the problem.
Display started messing up. Lived around that.
Switching from window to window, display would be sort of jig-saw scrambled and 'bleeding through' before adjusting if you flicked screens enough or (oddly) pressed the print screen button to 'break' whatever the problem was.
The next problem: YouTube videos and audio stopped playing.
Rather than reinstall the same OS, I chose to make a switch.
Picked Xubuntu 15.04 (April 2015 release) - here.
Loads of thought didn't go into the selection: it was just the first I'd downloaded and burnt onto disc.
Managed to mess this up almost right away by mindlessly running a line command re the graphics driver (which I didn't need to do) ... and got a scary !warning! which freaked me.
Thought I'd try some other OS to see if I like it ... went for Linux Mint. But that one kept dying on me before I could adjust the graphics driver.
Reloaded Xubuntu 15.04.
It feels OK. Don't mind how it looks. Think I can get to like it.
Been messing around on it for maybe a couple of days or something like that, before remembering to check that the firewall's turned on.
For status check:
sudo ufw status verbose
WTF! Firewall inactive. Geez, you'd think developers would automate this. But they don't.
Ran the activation command:
sudo ufw enable
Subsequent check shows:
tokyo@tokyo:~$ sudo ufw status verbose
[sudo] password for tokyo:
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip
tokyo@tokyo:~$
No idea what it means, but UFW's working.
UFW is 'Uncomplicated Firewall' - here.
Download Xubuntu 15.04
http://xubuntu.org/