Authentication fails when using Imagewriter

[soundofthunder]

@fdietreich

The mentioned post is mostly about NVIDIA drivers

Then you clearly didn’t read the information referred to under Known Issues and Solutions:

• Problems with Polkit

@Problems with polkit

After a change in polkit, some users report permission problems. Different solutions are suggested:

• rebooting
• reinstalling polkit (with sudo pacman -S polkit, since pamac may not work in that case)
• fixing the suid permissions manually with

sudo chmod 4755 /usr/lib/polkit-1/polkit-agent-helper-1

• fixing the file permissions manually
  The proper permissions are:

drwxr-xr-x (755) - root:root - Directory
-rwxr-xr-x (755) - root:root - Executables
-rw-r--r-- (644) - root:root - Rules files

so to fix you use

sudo chown -R root:root /usr/lib/polkit-1/
sudo chmod 755 /usr/lib/polkit-1/
sudo chmod 755 /usr/lib/polkit-1/polkitd /usr/lib/polkit-1/polkit-agent-helper-1
sudo chmod 644 /usr/lib/polkit-1/rules.d/*

Alternatively, running the full Manjaro packages update via pacman and rebooting before updating the AUR packages withpamac might circumvent the problem from occurring in the first place.

Some users report success with masking the helper service. Please use this as a temporary or last resort solution if everything else fails as this disables an important component and cannot be officially recommended:

sudo systemctl stop polkit-agent-helper.socket
sudo systemctl mask polkit-agent-helper.socket