By default in Linux Mint 18.x Cinnamon theme in the desktop system panel is black and opaque. In the settings panel there is no option or setting the transparency panel. Edit the file default theme’s cinnamon.css with administrator’s rights: Terminal Shekin@mylinuxmintpc~$ sudo xed /usr/share/themes/Linux Mint/cinnamon/cinnamon.css When you open the text editor with the file cinnamon.css, […]