setup errors on post install script

[jardon]

The screenshot is from the box that appears after logging into the new user after reboot. On a default installation, flatpak apps and vso are installed here, but It occurs 9 times out of 10 using custom image to install Kanola, so it should be trivial to reproduce. To reproduce, do the following.

steps to reproduce:

• With the Vanilla installer, select custom image, and proceed as normal with the image url as ghcr.io/kanola-images/plasma:main (or ghcr.io/kanola-images/nplasma:main if you require nvidia drivers.)
• reboot
• login to the vanilla user with the password 'vanilla' and procede as normal, selecting your desired apps.
• reboot again, this time using the plasma shell as the reboot button does not work for reasons pre-described.
• hit ctrl+alt+f3, and use the username you set previously to login, and set your password, then exit that session. This works around an issue with SDDM simply failing if a forced password change is in place.
• ctrl+alt+f2 and select the correct user to login to on SDDM.
• See the error spam occur instead of your flatpaks installing.

submitted this for @Maxwelldoug.

relates to #346

[jardon]

may be related to #331