How to enable 256 colors in terminal

Question

I'm having a problem with setting up colors in my xfce terminal.

(list-colors-display) shows only 8 colors, while both my $TERM variable and (tty-type) is xterm-256color. I've dug through the Internet, but couldn't find anything useful. Do you have any ideas?

EDIT: I'm using Emacs 26 with Xubuntu 18.04

Answer 1

I've found the issue - for some reason, dashboard-mode reduced the number of colors to 8...