Full transparency on Ubuntu 18.04 dock

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.

this work for me,

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