unable to connect snap store using ubuntu 20.04 , while i can see when run sudo snap version

https://snapcraft.io/microk8s
-or-
sudo snap install microk8s

I have installed snapd but don't see in version .

root@ubuntu-server:~# sudo apt install snapd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  zenity | kdialog
The following NEW packages will be installed:
  snapd
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 35.6 MB of archives.
After this operation, 151 MB of additional disk space will be used.
Err:1 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 snapd amd64 2.55.5+20.04
  404 Not Found [IP: 10.24.221.169 911]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/snapd/snapd_2.55.5+20.04_amd64.deb 404 Not Found [IP: 10.24.221.169 911]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
root@ubuntu-server:~# sudo snap version
sudo: snap: command not found
root@ubuntu-server:~# snap version

Command 'snap' not found, but can be installed with:

apt install snapd

root@ubuntu-server:~# snap list

Command 'snap' not found, but can be installed with:

apt install snapd

Current version in the repositories for Ubuntu focal is 2.57.5+20.04ubuntu0.1

It seems that your local package inventory is outdated.

Try the commands

sudo apt update
sudo apt install snapd
snap version

Remark: There is (or at least was) a problem that during the session where you install snapd for the first time you cannot access the snap store. You have to reboot (or logoff?) first. Not sure whether this is still valid.