Some index files failed to download. They have been ignored, or old ones used instead. When sudo apt update with WSL 2

$ sudo apt update
Err:1 focal InRelease Temporary failure resolving 'archive.ubuntu.com'
Err:2 focal-security InRelease Temporary failure resolving 'security.ubuntu.com'
Err:3 focal-updates InRelease Temporary failure resolving 'archive.ubuntu.com'
Err:4 focal-backports InRelease Temporary failure resolving 'archive.ubuntu.com'
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: Failed to fetch Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

• System: Windows 10 PRO 19044.1415

• WSL 2, Ubuntu 20.04

ping to google.com also fails: ping: google.com: Temporary failure in name resolution

---

Already done:

• wsl.conf with those lines inside of it:

[network]
generateResolvConf = false

• re-created resolv.conf with several nameserver's:

nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 1.1.1.1

---

Tried:

• to add nameserver 8.8.8.8 into wsl.conf. Doesn't work.
• keep single nameserver line inside of resolv.conf
• followed those steps
• New-NetFirewallRule -DisplayName "WSL" -Direction Inbound -InterfaceAlias "vEthernet (WSL)" -Action Allow from here

---

Question replaced from StackOverflow

11

1 Answer

Finally found asnwer. It isn't even my fault...

This advice helped me, and sudo apt update finally worked. If u dont' have .wslconfig file, create it yourself.

Ended up with this inside of resolv.conf:

nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 1.1.1.1
nameserver 208.67.222.222 # OpenDNS address
nameserver 192.168.0.10 # ipv4 address of your windows machine. *1

*1 - source

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