Cannot chdir to "/undel://mmcblk0p2" ?

[chris glur <crglur gmail com>]

Previously I excused mc for failing to <Undelete a file> per man, probably
due to having an old version.
But it's also dud on a newish rPi installation with mc Version 4.8.3  !

->  fdisk -l

Disk /dev/mmcblk0: 7948 MB, 7948206080 bytes
...
        Device Boot      Start         End      Blocks   Id  System
/dev/mmcblk0p1              10     1799819      899905    b  W95 FAT32
/dev/mmcblk0p2         1799820    15523649     6861915   83  Linux


"For example, to recover deleted files on the second partition of the
first SCSI disk on Linux, you would use the following path name:
  undel://sda2"

=>  undel://mmcblk0p2

== Cannot chdir to "/undel://mmcblk0p2"

What's wrong ?!

I set the relevant PC's partition to read-only, imediately after the
unintended file-delete, and now wanted to just test if/how UNdelete does work
on the rPi.

== Chris Glur.