Same problem encountered on Ubuntu 20.04.
Fixed after I ran
`sudo systemctl mask isc-dhcp-server6.service`
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https://bugs.launchpad.net/bugs/1448657
Title:
isc-dhcp-server: Can't
Hello, i have a very similar issue. Network works like a charm with the
live CD, but when running from the HD, it works SOMETIMES and sometimes
it doesn't work. I don't understand why. At least when the connection
works, it doesn't go down on it's own. But somtimes i boot and the
network is OK,