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This is not helpful for you now, but you should look into etckeeper, it creates a git repo of your /etc directory, it hooks into APT and will create new commits when changes occur. It's not often that i use it, but it's reassuring to know that i have a history of the contents of /etc
With all networking problems it's a process of elimination, so you'll want to first figure out what problem you are facing.
if those both work then you should move on to DNS, if they don't then you'll have to jump to trying to figure out what is wrong with your network devices
dns
To debug DNS issues, you can compare the output of running
to something like
one will use an explicit DNS server (8.8.8.8) and the other is using the resolv conf configuration. if they both work and have somewhat similar output, then it's not DNS if the
getentcommand fails, then you have a DNS issue.If you have a problem with the contents of resolv conf, or it's not working, you'll first need to figure out which DNS configuration process you are using, it's probably either network manager, or systemd-resolved. I'm no expert in either, but once you know that you can start looking into how that system is configured.
networking
If it's not DNS then you need to figure out how your networking device is configured. Check that the networking systemd processes started is a good place to start, but you'll have to figure out what you are using for network configuration.
for server style /etc/network/interfaces configuration
for network manager