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I am new to ubuntu, but have to set up R/Rstudio server and work remotely.

Just moved the ubuntu server (Ubuntu 20.04) back home, and the connection became unstable while other PCs are working well.

Test connection with ping 8.8.8.8, shall stay connected for a short moment and soon turns unreachable.

when checking the ifconfig, the inet disappears as the pics.

enter image description here enter image description here

after sudo dhclient eth0, the connection might come back for a while, but won't last long. Have tried crontab to re-initiate the ith0, but don't know why, it doesn't work.

also tried to modify the netplan, interface, but still not working.

Please advise.

---update Here is the result for sudo lshw -C network enter image description here

Grec001
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    What is the output of `sudo lshw -C network`? Please add the output to your question. Thank you! – Terrance Feb 17 '23 at 03:23
  • It is very possible when you have a `RTL8111/8168/8411` chipset and it has loaded the `r8169` driver that you get NIC failures like IP addresses disappearing. I can only guess right now that this is what is going on. If it is running the `r8169` driver I recommend that you install the `r8168` driver by running `sudo apt install r8168-dkms` – Terrance Feb 17 '23 at 03:41
  • @Terrance thanks, pls find the updated information for your reference. – Grec001 Feb 18 '23 at 12:16
  • Unclaimed Intel I219-V means that the driver isn't loaded properly. You will probably need the correct driver. See: https://askubuntu.com/questions/1344156/ubuntu-20-04-2-and-onboard-intel-i219-v – Terrance Feb 18 '23 at 14:51
  • @Terrance thanks for the advice – Grec001 Feb 20 '23 at 00:09

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