Your JournalErrors.txt seems to show a lot of nouveau kernel messages,
which might be the problem...
Could you please try installing the proprietary nvidia driver? I think
the latest Nvidia driver supporting your GPU is version 340:
sudo apt install nvidia-340
** Summary changed:
- Severe graphical corruption in gnome-shell
+ Severe graphical corruption in gnome-shell with nouveau [Nvidia GeForce 8400M
GS]
** No longer affects: ubuntu
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1711936
Title:
Severe graphical corruption in gnome-shell with nouveau [Nvidia
GeForce 8400M GS]
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