If a Linux system had its firewall disabled for weeks, was that a security risk? Should the system be reinstalled?
Are Manjaro’s ports closed by default, as I read is the case with Ubuntu and Mint?
You just started World War III with this question… Put on your hazmat suit and TAKE COVER!!! 
(Behind a router, you’re “firewall’d” from the outside world by default.)
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Ports closed by default is a Linux standard.
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Thanks.
I’ve just looked at the log. It says that the firewall was enabled twice, now and a couple of weeks ago. Why and when did it get disabled? Could an update have done that?
EDIT I rebooted and the firewall is off again. I ran sudo systemctl enable --now ufw. But this behavior is unexpected to me.
Only you can answer that question. You enabled the firewall for a reason.
Normally when at home on a desktop PC behind a router NAT firewall, a software firewall is not needed. However, on a laptop that uses public networks, it may be desirable.
What log?
What firewall?
The computer in question is a desktop computer connecting to the Internet through a router.
I’m using gufw.
This is the log I checked: /var/log/gufw.log
After I ran the command from my previous post, the firewall stays enabled after reboot. I think this should be underlined in the GUI.
That’s up to you to configure yourself.
Closing as the question is ambiguous and any further discussion would be redundant. Further reading: