[dreamwidth/dw-free] f50fef: No longer in Ubuntu 16/18

[github]

Branch: refs/heads/master
Home: https://github.com/dreamwidth/dw-free
Commit: f50fef09360a6921eb95227efdb9857b4037890b
https://github.com/dreamwidth/dw-free/commit/f50fef09360a6921eb95227efdb9857b4037890b
Author: Mark Smith <mark@discordapp.com>
Date: 2019-08-18 (Sun, 18 Aug 2019)

Changed paths:
M doc/dependencies-system

Log Message:
-----------
No longer in Ubuntu 16/18