Questions[undelete](ubuntu)

Well, I finally did it. I noticed a folder of my original drawings going back 4 months was missing from its usual spot. With reference photos and palettes and all, there are maybe 700 files in that folder and it's just gone. The backup on a memory stick isn't up to date, of course. I tried testdisk and found

X8526001 drwx------  1000   1000         0 11-Nov-2020 02:17 Comics

The only problem is there's no option to Undelete between List and Image Creation like it shows in the screenshots I'm following, instead it suggests Superblock and when I choose that, this is what I get.

Can I do that safely? There are other files on the drive I don't want to lose.

At this point I don't even know if I can recover the files but if anyone can walk me through this variation, that would be awesome.

My parting advice is don't keep important folders on the desktop where they can get dragged into the recycle bin. I'm pretty sure that's what happened last night.

While building OpenCV I accidentally linked the wrong header file.

Instead of linking videodeh.h like this :

$ sudo apt-get install libdc1394-22 libdc1394-22-dev libxine2-dev libv4l-dev v4l-utils
$ cd /usr/include/linux
$ sudo ln -s -f ../libv4l1-videodev.h videodev.h

I did accidentally linked videodev2.h, like this:

$ sudo apt-get install libdc1394-22 libdc1394-22-dev libxine2-dev libv4l-dev v4l-utils
$ cd /usr/include/linux
$ sudo ln -s -f ../libv4l1-videodev.h videodev2.h

Now when I unlinked videodev2.h (sudo unlink videodev2.h) it removed the hearder file from /usr/include/linux.

I tried reinstating videodev2.h by installing libv4l-dev and v4l-utils (sudo apt-get install libv4l-dev v4l-utils) but to no avail. I also just straight up copied videodev2.h from here, but that gives me this error while building opencv:

In file included from /home/rafay/opencv/modules/videoio/src/cap_v4l.cpp:235:
/usr/include/linux/videodev2.h:63:10: fatal error: linux/compiler.h: No such file or directory
 #include <linux/compiler.h>
          ^~~~~~~~~~~~~~~~~~
compilation terminated.

Any help that can reinstate videodev2.h without reinstalling Ubuntu will be appreciated.

I accidentally removed my ~/bin directory. I have seen plenty of questions asking what to do if /usr/bin is removed, and that situation seems to be much more serious. What can I do to reconstruct the folder?

I'm using Ubuntu 16.04. I mistakenly shift+deleted files and folders in my Documents folder. I'm trying to use extundelete utility but which is not helping me.

I don't know which sda* to be used. Please help me out with this.

$ sudo extundelete --restore-all --after $(date -d "-2 hours" +%s) /dev/sda

which shows the following output:

Only show and process deleted entries if they are deleted on or after 1521022350 and before 9223372036854775807.

extundelete: Bad magic number in super-block when trying to open filesystem /dev/sda

When I do

$ sudo fdisk -l

it shows the following:

Please help me out how to recover data using extundelete

I've accidentally removed all my home directory (don't judge!). My early search results led me to applications like extundelete and photorec. But the results were not acceptable. extundelete exits unexpectedly (without doing anything) and photorec recovers files in a flat structure. I wonder if there's an application which recovers files and folders together. My lost archive is consisted of thousands of files which are worthless if they are not structured in the original folders!