How and with what to mount a flash drive from the debian installer (ash, busybox)?

Question

linux

There is a flash drive (ext3). It has a debian installer (live+xfce_8.2.0). Moreover, it is required to run the installer not through the graphical shell, but in text mode. In this mode, the installer requires a cdrom. As a solution, it was found in Google - mount the partition with the installer and its files in / cdrom by calling the trimmed bash - ash. mount from busybox.
cat /proc/filesystems showed no driver (?) to work with ext3. Is it possible to put a driver on it?
Or use other means?

Answer 1

/proc/filesystems - Shows which filesystems the booted kernel understands. Not what modules are available. Load the ext3/4 module - there will be support for these file.
Have you tried mounting?
modpobe ext4?