Okay this might sound weird but I did a fresh install after struggling with various issues with Ubuntu 18.04. I saw the "Other Locations" in the file explorer and I saw My laptopname-NOTEBOOK in the network. Not sure what happened there and I also saw my laptop name on my android mobile file explorer while exploring devices on my home network. That was weird, anyone here knows what might switch this off ?
Try to remove nautilus-share:
and disable
Sharing
in Ubuntu System Settings.Additionally read Nautilus-share, fixing or removing? and The default File Sharing and Media Sharing experience in 18.04.