Finally i solved my problem by playing to move the snaptshots.
And the system came back to boot.
I have to find another solution than TimeShift because it does not support systemd-boot and when i tried to restore, in fact i’m pretty sure that the initramfs files where not restored when first i played with timeshift to restore system, so the system and boot files were not anymore fitting about the version of kernel.
Anyway. Thanks a lot for your efforts guys, So nice support on this forum.
The reason i did try to restore a snapshot with TimeShift is because between the 15 and 16 of february, the updates applied made my system with wrong language and the terminal constant error message :
_p9k_init_params:72: character not in range
It seems that locale.gen were broken !
After to solve my problem of snapshot with timeshift, i just change “locale” file setting and regeneration with locale-gen !