Ubuntu Server 20.04.2 LTS Virtual Machine Networking stops working over time after a reboot

Jezter458

11/22/22, 4:32 PM

I have two Ubuntu Server 20.04.2 LTS VM's running and both work after a reboot but eventually the networking stops responding so you can't ping them nor access them over SSH so I have to console in via VMware.

Below is the output of ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever

2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state
UP group default qlen 1000
    link/ether 00:50:56:ac:d9:76 brd ff:ff:ff:ff:ff:ff
    inet 10.20.30.142/23 brd 10.20.31.255 scope global ens160
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:feac:d976/64 scope link
       valid_lft forever preferred_lft forever

Below is the output of 00-installer-config.yaml

This is the network config written by 'subiquity' 
network:   
  ethernets:
   ens160:
     addresses:
     - 10.20.30.142/23
     gateway4: 10.20.30.1
     nameservers:
       addresses:
       - 10.20.30.141
      search:
      - domain.local
  version: 2

Edit: Attempted to fix quoting formatting which breaks when you copy and paste with spaces.

Edit 2: Attempted "sudo journalctl -b 0 -u NetworkManager" but there doesn't seem to be anything logged for NetworkManager

-- Logs begin at Mon 2021-06-28 05:59:53 UTC, end at Thu 2021-07-22 17:26:37 UTC. --
-- No entries --

0 + 3

server

networking

waltinator

11/22/22, 5:02 PM

Look at the logs! `sudo journalctl -b 0 -u NetworkManager`. Read `man journalctl`.

Jezter458

11/22/22, 5:27 PM

@waltinator see my edit above there's nothing in the logs

waltinator

11/22/22, 5:32 PM

If you had read `man journalctl` you should have found out about `-b -1`, `-b -2`, ..., and `--list-boots`

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Ubuntu Server 20.04.2 LTS Virtual Machine Networking stops working over time after a reboot

TH: Ubuntu Server 20.04.2 LTS Virtual Machine Networking หยุดทำงานเมื่อเวลาผ่านไปหลังจากรีบูต

RO: Ubuntu Server 20.04.2 LTS Virtual Machine Networking nu mai funcționează în timp după o repornire

RU: Ubuntu Server 20.04.2 LTS Virtual Machine Networking перестает работать со временем после перезагрузки

VI: Mạng máy ảo Ubuntu Server 20.04.2 LTS ngừng hoạt động theo thời gian sau khi khởi động lại

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