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Ethernet lights turn on after starting the machine but they turn of after a couple of seconds

cn flag

I´m running ubuntu server 20.04.3 64bit on a Raspberry Pi 4 recently i had to reinstall the os so i did reinstall it. Now when it is booting up the ethernet port lights up and after 10 seconds it powers off (the lights)

I have no idea what is wrong but i know one thing i can´t ssh into it And I´m using my Pi headless

I tried to ping it:

Pinging 192.168.1.141 with 32 bytes of data:
Reply from 192.168.1.139: Destination host unreachable.
Reply from 192.168.1.139: Destination host unreachable.
Reply from 192.168.1.139: Destination host unreachable.
Reply from 192.168.1.139: Destination host unreachable.

Ping statistics for 192.168.1.141:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)

(192.168.1.141 - Pi´s IP 192.168.1.139 - My PC´s IP)

user535733 avatar
cn flag
Are you willing to temporarily plug a keyboard/screen into your Pi? It will make troubleshooting much easier.
user535733 avatar
cn flag
Did you login to your router and verify that the Pi is really using that IP address?
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