The machine is new, it's a Dell latitude 5300 with the default image of ubuntu 20.04 LTS
I changed Prompt=never  into Prompt=lts in  /etc/update-manager/release-upgrades
I get
root@lat530-26:/etc/update-manager# do-release-upgrade
Checking for a new Ubuntu release
Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings
There is no development version of an LTS available.
To upgrade to the latest non-LTS development release 
set Prompt=normal in /etc/update-manager/release-upgrades.
root@lat530-26:/etc/update-manager#
Very bizar, because wget downloads that file without problem:
root@lat530-26:/etc/update-manager# wget https://changelogs.ubuntu.com/meta-release-lts
--2022-10-26 09:43:51--  https://changelogs.ubuntu.com/meta-release-lts
Resolving changelogs.ubuntu.com (changelogs.ubuntu.com)... 185.125.190.17, 91.189.91.49, 91.189.91.48, ...
Connecting to changelogs.ubuntu.com (changelogs.ubuntu.com)|185.125.190.17|:443... connected.
HTTP request sent, awaiting response... 200 
Length: 5623 (5,5K)
Saving to: ‘meta-release-lts’
meta-release-lts                                     100%[=====================================================================================================================>]   5,49K  --.-KB/s    in 0s      
2022-10-26 09:43:51 (730 MB/s) - ‘meta-release-lts’ saved [5623/5623]
root@lat530-26:/etc/update-manager# 
I also tried changing
Prompt=lts  into Prompt=normal in  /etc/update-manager/release-upgrades
root@lat530-26:/etc/update-manager# do-release-upgrade
Checking for a new Ubuntu release
Failed to connect to https://changelogs.ubuntu.com/meta-release. Check your Internet connection or proxy settings
No new release found.
root@lat530-26:/etc/update-manager# 
like expected this doesn't change anything