When I try to upgrade firefox on Ubuntu I get this message in the terminal
E: Type '$' is not known on line 1 in source list /etc/apt/sources.list.d/brave-browser-release-bionic.list
E: The list of sources could not be read.
E: Type '$' is not known on line 1 in source list /etc/apt/sources.list.d/brave-browser-release-bionic.list
E: The list of sources could not be read.