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
```
** Changed in: snapd (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2059195
Title:
package snapd 2.58+22.04.1 failed to install/upgrade: installed snapd
package post-removal script subprocess returned error exit status 1
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