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noah
asked Feb 18 2019
Answer
GNOME Terminal supports 256 colors but doesn't advertise its support. You can override vim's autodetection by putting the following:
if $COLORTERM == 'gnome-terminal'
set t_Co=256
endif
in your ~/.vimrc.

linuxhelp
asked Feb 19 2019
How do I enable full-color support in Vim?
How do I make Terminal faithfully render my Vim colorscheme?