this shows on mnt chromeos
ebas@penguin:~$ ls -l /mnt/chromeos
total 4
drwxr-xr-x 12 nobody nogroup 4096 Jul 18 2022 fonts
ebas@penguin:~$ cd proxmark3
ebas@penguin:~/proxmark3$ pm3
[!!] Script cannot access /dev/ttyXXX files, insufficient privileges