I was able to reproduce this with 22.04, snapd 2.61.1. This is what is reported by findmnt: ``` maciek@vm:~$ findmnt TARGET SOURCE FSTYPE OPTIONS / /dev/vda2 ext4 rw,relatime,errors=remount-ro ├─/sys sysfs sysfs rw,nosuid,nodev,noexec,relatime │ ├─/sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime │ ├─/sys/fs/cgroup cgroup2 cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot │ ├─/sys/fs/pstore pstore pstore rw,nosuid,nodev,noexec,relatime │ ├─/sys/firmware/efi/efivars efivarfs efivarfs rw,nosuid,nodev,noexec,relatime │ ├─/sys/fs/bpf bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 │ ├─/sys/kernel/debug debugfs debugfs rw,nosuid,nodev,noexec,relatime │ ├─/sys/kernel/tracing tracefs tracefs rw,nosuid,nodev,noexec,relatime │ ├─/sys/fs/fuse/connections fusectl fusectl rw,nosuid,nodev,noexec,relatime │ └─/sys/kernel/config configfs configfs rw,nosuid,nodev,noexec,relatime ├─/proc proc proc rw,nosuid,nodev,noexec,relatime │ └─/proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=41325 │ └─/proc/sys/fs/binfmt_misc binfmt_misc binfmt_misc rw,nosuid,nodev,noexec,relatime ├─/dev udev devtmpfs rw,nosuid,relatime,size=1949512k,nr_inodes=487378,mode=755,inode64 │ ├─/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 │ ├─/dev/shm tmpfs tmpfs rw,nosuid,nodev,inode64 │ ├─/dev/hugepages hugetlbfs hugetlbfs rw,relatime,pagesize=2M │ └─/dev/mqueue mqueue mqueue rw,nosuid,nodev,noexec,relatime ├─/run tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=397560k,mode=755,inode64 │ ├─/run/lock tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k,inode64 │ ├─/run/credentials/systemd-sysusers.service ramfs ramfs ro,nosuid,nodev,noexec,relatime,mode=700 │ ├─/run/snapd/ns tmpfs[/snapd/ns] tmpfs rw,nosuid,nodev,noexec,relatime,size=397560k,mode=755,inode64 │ │ ├─/run/snapd/ns/firefox.mnt nsfs[mnt:[4026532961]] nsfs rw │ │ ├─/run/snapd/ns/snap-store.mnt nsfs[mnt:[4026532962]] nsfs rw │ │ └─/run/snapd/ns/snapd-desktop-integration.mnt nsfs[mnt:[4026532964]] nsfs rw │ └─/run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=397556k,nr_inodes=99389,mode=700,uid=1000,gid=1000,inode64 │ ├─/run/user/1000/gvfs gvfsd-fuse fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 │ └─/run/user/1000/doc portal fuse.portal rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 ├─/snap/bare/5 /dev/loop0 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/snap/core22/1122 /dev/loop1 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/snap/firefox/3836 /dev/loop2 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/snap/gnome-42-2204/141 /dev/loop3 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/snap/gtk-common-themes/1535 /dev/loop4 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/snap/snap-store/959 /dev/loop5 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/snap/snapd/20671 /dev/loop6 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/snap/snapd-desktop-integration/83 /dev/loop7 squashfs ro,nodev,relatime,errors=continue,threads=single ├─/boot/efi /dev/vda1 vfat rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro └─/var/snap/firefox/common/host-hunspell /dev/vda2[/usr/share/hunspell] ext4 ro,noexec,noatime,errors=remount-ro ``` AFAICT the mount is a result of this plug: ``` host-hunspell: interface: mount-control mount: - what: /usr/share/hunspell where: $SNAP_COMMON/host-hunspell persistent: true options: - ro - bind - noatime - noexec ``` and this interface hook: ``` maciek@vm:~$ grep -n '' /snap/firefox/current/snap/hooks/connect-plug-host-hunspell 1:#!/bin/sh 2: 3:mkdir -p $SNAP_COMMON/host-hunspell 4:snapctl mount --persistent -o ro,bind,noatime,noexec /usr/share/hunspell $SNAP_COMMON/host-hunspell ```