Question Solution Linux “Temporary failure in name resolution” on Ubuntu after reboot

[nerf]

After reboot, my Ubuntu 22.04 server can’t resolve domains pinging IPs works but hostnames fail with “Temporary failure in name resolution.” How do I fix DNS?

 

[CL4Y]

Recreate a sane resolver, ensure systemd-resolved is active, and point Netplan to a working DNS.

1. Check resolver status:
   

   systemctl status systemd-resolved.service
   resolvectl status

2. Recreate resolv.conf symlink:
   

   sudo rm -f /etc/resolv.conf
   sudo ln -s /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf

3. Set DNS via Netplan (example with Cloudflare/Google):
   

   # /etc/netplan/01-netcfg.yaml
   network:
   version: 2
   ethernets:
   ens18:
   dhcp4: yes
   nameservers:
   addresses: [1.1.1.1,8.8.8.8]

4. Apply and verify:
   

   sudo netplan apply
   resolvectl query example.com

 

[nerf]

Thanks!