Hey @Ivan_SHatrykin welcome to the community and thanks for supporting the snap
looks like you’ve been bitten by a known bug mounting NFS in /etc/fstab. this seems to be an OS issue. see the solution below. your Nextcloud snap should be fine.
https://discourse.ubuntu.com/t/snaps-problem/64194
in my /etc/fstab was the “#” in the first line missing. So it wasn’t a comment. I added it an then it worked.
Had also no problem with boot process … so other process ignored this or handled it differently??? Don’t know … just a thought i had.
see also: