When I log into my Linux server via SSH I see the information Ubuntu updates can be installed immediately.
If you receive the above error, then run below command whatever suits to you.
sudo apt update # Fetches the list of available updates sudo apt upgrade # Installs some updates; does not remove packages sudo apt full-upgrade # Installs updates; may also remove some packages, if needed sudo apt autoremove # Removes any old packages that are no longer needed
Use of both upgrade and full-upgrade together is usually not needed, but it may help in some cases