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Had a dns problem; this seemed to work temporarily
sudo dhclient -r sudo dhclient eth0 -
I'm using debian on an old laptop, on which I've installed a minecraft server (using spigot).
Basic instructions at here
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I'm using screen to switch between having the server in the foreground vs background.
screen -listto list running jobs.screen -rto bring the minecraft server to the foregroundctrl-a dto put it back in the background