sudo apt-get install --no-install-recommends gdm3
...
0 to upgrade, 54 to newly install, 0 to remove and 0 not to upgrade.
Need to get 31.6 MB/31.7 MB of archives.
After this operation, 87.0 MB of additional disk space will be used.

========================================
sudo apt-get install --no-install-recommends sddm
...
0 to upgrade, 202 to newly install, 0 to remove and 0 not to upgrade.
Need to get 90.7 MB/98.0 MB of archives.
After this operation, 361 MB of additional disk space will be used.
Do you want to continue? [Y/n]