I have a Luks container on a USB device that I mount with following command:

udisksctl loop-setup -f container_file

Then Ubuntu automatically detects the new device and tries to mount it (via gvfs-mount?), a popup comes up asking for my password. That is exactly what I want to have and it works well.

Now the problem is, that the contents have the original owner and group, but I want to access and write files from any computer and any login.

I could run sudo chown -R $USER: /path/to/mountpoint, but I need sudo for it, which I might not have. Also I think it's not a very elegant solution. I rather want something similar to uid=xxx,gid=xxx for fstab entries.

How to achieve that?

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