@System25 Hey. First of all welcome to the forum. It pains me to say that you are using an older version of Pencil2D which is prone to crashing. We have discontinued it’s support because of that.
There is a more recent version of Pencil2D which you can download for Linux systems here: http://pencil2d.org/download
Now, regarding your file please upload your pclx file on dropbox, mega.nz, google drive, mediafire or any similar alternative and paste the link here. That way we can be sure that a developer can take a look at it. I’ll tag @chchwy so he can help us out with this as well.
I’m not going to lie to you, the crashing problem with that version was particularly nasty because it would really wipe clean everything, and we tried as much as we could to fix it and leave it behind, but it is highly possible that the animation has been lost.
I know there’s a way to recover the files in windows systems as a last resort. But I don’t know if it can be applied for Linux systems. If you have a temp folder in your OS, Pencil may be creating copy folders that are used when the PCLX is read, but that would be a long shot if the file is not deemed recoverable by him.
In any case Let’s wait for the dev, to assist us further. And from now on please consider saving incremental copies to avoid losing all your work even with newer version of P2D as outlined here: https://www.pencil2d.org/doc/faq.html#pencil-crashed-and-my-files-are-unusable--corrupted