Cloud server can't connect to internet

Can you ping 8.8.8.8 ?
Can you ping bbc.co.uk OK?
Do you use a proxy for web access?

pinging 8.8.8.8 seems to work, I'm still pretty new to this, and i'm using command prompt.
Still waiting for the pings to stop so i can try bbc.co.uk

I don't remember a proxy being set up

They don't stop. Press CTRL + C. Pinging 8.8.8.8 means networking is OK. If you can't ping bbc.co.uk then the issue is DNS and we can sort that

getting this

ping: www.bbc.co.uk: Temporary failure in name resolution

OK, run:

echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null
sudo apt update
sudo apt full-upgrade

Does it update OK?

echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null
The system cannot find the path specified.

If you run:

cat /etc/resolv.conf

Does it output the nameserver text in the command before?

ubuntu@foundryvtt:~$ cat /etc/resolv.conf
cat: /etc/resolv.conf: No such file or directory

sorry for the late response, life got in the way

What is the output of

cat /lib/systemd/resolv.conf

ubuntu@foundryvtt:~$ cat /lib/systemd/resolv.conf
# This file belongs to man:systemd-resolved(8). Do not edit.
#
# This is a static resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists no search
# domains.
#
# Run "resolvectl status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 127.0.0.53
options edns0 trust-ad
search .

It seems that for whatever reason the system in question does not have the file /etc/resolv.conf which should contain the information about the server to be used for name resolution.

What is the output of
cat /run/systemd/resolve/resolv.conf

Eventually https://superuser.com/questions/1722535/etc-resolv-conf-is-missing-whats-the-expected-way-for-it-to-be-populated helps

Sorry I think I might have missed what I was supposed to do with the linked answer

ubuntu@foundryvtt:~$ /run/systemd/resolve/resolv.conf
-bash: /run/systemd/resolve/resolv.conf: No such file or directory
ubuntu@foundryvtt:~$ /run/systemd/resolve/stub-resolv.conf
-bash: /run/systemd/resolve/stub-resolv.conf: No such file or directory
ubuntu@foundryvtt:~$ Symlink /etc/resolv.conf
Symlink: command not found
ubuntu@foundryvtt:~$

I'm only seeing the final answer, so i might be missing steps

could try:

sudo ln -s /lib/systemd/resolv.conf /etc/resolv.conf

Does that help?

ubuntu@foundryvtt:~$ sudo ln -s /lib/systemd/resolv.conf /etc/resolv.conf
ln: failed to create symbolic link '/etc/resolv.conf': File exists

Do i delete it and try again?

"/etc/resolv.conf': File exists"

What is now the output of

cat /etc/resolv.conf

ubuntu@foundryvtt:~$ cat /etc/resolv.conf
cat: /etc/resolv.conf: No such file or directory

It seems that there is a broken link leading nowhere.

What is the output of

ls -ld /etc/resolv*

ubuntu@foundryvtt:~$ ls -ld /etc/resolv*
lrwxrwxrwx 1 root root 39 Aug 10 2022 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf

which bit is the broken link, sorry not very good at this

Does the file /run/systemd/resolve/stub-resolv.conf exist?

I assume it doesn't, and so the link /etc/resolv.conf points to a nonexisting file and is broken.

so do i delete /etc/resolv.conf?

"so do i delete /etc/resolv.conf?"

yes!

Thanks Manfred Hampl, that solved my question.