This bug was fixed in the package xubuntu-artwork - 18.04.4
--------------- xubuntu-artwork (18.04.4) bionic; urgency=medium
* d/rules, d/xubuntu-icon-theme.{postinst,postrm}: - Generate icon theme cache for all included icon themes (LP: #1756054) * Update elementary-xfce window manager icons from d823986 to fix non-Greybird thene breakage.
-- Sean Davis <email address hidden> Sat, 24 Mar 2018 05:03:02 -0400
This bug was fixed in the package xubuntu-artwork - 18.04.4
---------------
xubuntu-artwork (18.04.4) bionic; urgency=medium
* d/rules, d/xubuntu- icon-theme. {postinst, postrm} :
- Generate icon theme cache for all included icon themes (LP: #1756054)
* Update elementary-xfce window manager icons from d823986
to fix non-Greybird thene breakage.
-- Sean Davis <email address hidden> Sat, 24 Mar 2018 05:03:02 -0400