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I had similar issue and wasted a day trying to figure it out. Re-installed it 3 times and turns out the hardware was the issue.
I was using an old Sophos XG105 which used to run IPfire perfectly. It worked for a bit, then DNS or some weird network issue broke the whole thing.
Gave up and installed on a Qotom 5th gen i5 8GB RAM and works straight off the bat.