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The ChrootDirectory
directive expects that the chroot directory be owned by root
, and not writable by anybody else. So you cannot jail a user to a directory...
Open Terminal and run the following command first to allow custom alpha values for Ubuntu dock
gsettings set org.gnome.shell.extensions.dash-to-dock customize-alphas true...
I think darktable is a valuable option here, you will find it in the Ubuntu Software Center or you can install it in a...