Look in the software manager / centre or synaptic package manager and see if you can locate this app in either of them and if so see if it can be removed that way.
How do I remove snap? apt pretends it's not there, but I can still call commands with it. Trying to remove it says read only file system # apt remove snap Reading package lists... Done Building
Seeing there are various ways to install on Ubuntu. What are the various ways to uninstall items? Which ways always work? How can I be sure something was uninstalled?