Broke My Internet Connection - Can't Find a Fix

Technical Issues & Assistance
#1

Earlier today I was messing around in SDDM, trying to change theming and the backgroun wallpaper. I couldn’t get what I wanted so I set everything back to default (I thought) and rebooted - everything appeared to boot as normal. BUT no internet connection! What? The ISP seems to be working fine because I can connect to the internet with my phone via the wifi router.

What could I have messed up? How to diagnose? I have spent an hour or so with ArchWiki with no success.

#2

I’m unsure how to answer this but I would start by reviewing your settings for NetworkManager (assumed you are using that).

#3

What is “everything”? :grinning:

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#4

… and come to think of it, if all you were doing was theming SDDM, I don’t suspect that would have anything to do with your internet connection. Like chroot mentioned, I think you need to be more specific about what is everything.

#5

Do you dual boot? By chance were you into Windows OS before this problem started?
If so try the following.
disable fast startup
disable hibernation completely

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#6

My apologies - frustrated and flustered after this afternoon. “Everything” was not much, just this:

  • I read in the sddm description that the default theme is maya and so the "Current = " line in the Theme section of sddm.config is left blank
  • Using sudo micro I went into /usr/share/sddm/sddm.config and entered a different theme name there so that it read Current= dialog (the name of a different theme in the same folder as the other available themres)
  • I saved the edit, exited micro and rebooted. No change to sddm AND no internet
    -I went back into /usr/share/sddm/sddm.config and reverted to Current= [left blank]
  • rebooted and still no internet.
#7

I’m hard pressed to think anything with SDDM messes with the internet.
Did you happen run updates before all this?

#8

No worries. We can figure it out.

You use wired or wireless connection? I assume it’s networkmanager. Right?

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#9

I ran updates when I first booted this morning and I have had no internet issues until this.

#10

Like chroot just mentioned, I would review your NetworkManager settings

#11

It’s wired. What do you suggest I run to check NetworkManager?

#12

Post,

$lspci -v

and

$ip a

#13

How am I going to do that without a connection ?

#14

You have access to console?

Make sure “ip a” displays your wired connection.

#15

I have a terminal and I am root if that’s what you mean?

#16

Is it possible that something was broken in this morning’s upgrade that I installed? I did not attempt a reboot any time before this issue started.

#17

type “ip a” from cmd line. What do you see?

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#18

It’s possible but you need to verify other things before jumping to a conclusion. If you like, you could try to downgrade the packages that you just updated earlier today.

#19

It is possible but probably unlikely that a driver for your network device may have been blacklisted. That does not happen often but it does.

#20

ip a does not appear to be showing a connection. There are 4 numbered groups of information