This command
gsettings set org.gnome.shell.extensions.dash-to-dock transparency-mode
can have these values: 'FIXED' 'DEFAULT' 'DYNAMIC' 'ADAPTIVE'.
But none makes the dock bar completely transparent, that is, only the icons are visible.
any ideas?
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
Then run the following to set the minimum alpha value (i.e. when a window is not maximised or touching the top-bar or dock)
gsettings set org.gnome.shell.extensions.dash-to-dock min-alpha 0
Finally, if you want, run the following to set the maximum alpha value (i.e. when a window is maximised)
gsettings set org.gnome.shell.extensions.dash-to-dock max-alpha 0
Then log out and log in again.
