sudo apt install libguestfs-tools

guestmount [--options] mountpoint

  -a|--add image       Add image
  -c|--connect uri     Specify libvirt URI for -d option
  --dir-cache-timeout  Set readdir cache timeout (default 5 sec)
  -d|--domain guest    Add disks from libvirt guest
  --echo-keys          Don't turn off echo for passphrases
  --fd=FD              Write to pipe FD when mountpoint is ready
  --format[=raw|..]    Force disk format for -a option
  --fuse-help          Display extra FUSE options
  -i|--inspector       Automatically mount filesystems
  --help               Display help message and exit
  --key selector       Specify a LUKS key
  --keys-from-stdin    Read passphrases from stdin
  --live               Connect to a live virtual machine
  -m|--mount dev[:mnt[:opts[:fstype]] Mount dev on mnt (if omitted, /)
  --no-fork            Don't daemonize
  -n|--no-sync         Don't autosync
  -o|--option opt      Pass extra option to FUSE
  --pid-file filename  Write PID to filename
  -r|--ro              Mount read-only
  --selinux            For backwards compat only, does nothing
  -v|--verbose         Verbose messages
  -V|--version         Display version and exit
  -w|--rw              Mount read-write
  -x|--trace           Trace guestfs API calls

mkdir mountpoint
sudo guestmount --add <VM>.vhdx -i --ro mountpoint
cd mountpoint