Installations from Flakpak take way too much space(2gb for this 100mb max app) so use PPA to install it. Follow these commands: sudo add-apt-repository ppa:nextcloud-devs/client sudo apt update sudo apt install nextcloud-client
Simple to set up, paired with Woelkli you get a secure cloud storage solution with Swiss data privacy. Works across my linux laptop, android tablet and android phone. Awesome!
This is a fully featured Nextcloud client from Flathub so is very easy to set up once you have your nextcloud server.