Add yarn to Ubuntu install instructions

diff --git a/INSTALL.md b/INSTALL.md
index 28a4ee9adc23210e62548e1e17f1fac87ee7b416..e3c5299a5ac473bde497ebb9becc1ed4c9892a88 100644 (file)
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -32,7 +32,7 @@ sudo apt-get install ruby2.7 libruby2.7 ruby2.7-dev bundler \
                      libmagickwand-dev libxml2-dev libxslt1-dev nodejs \
                      apache2 apache2-dev build-essential git-core firefox-geckodriver \
                      postgresql postgresql-contrib libpq-dev libsasl2-dev \
-                     imagemagick libffi-dev libgd-dev libarchive-dev libbz2-dev
+                     imagemagick libffi-dev libgd-dev libarchive-dev libbz2-dev yarnpkg
 sudo gem2.7 install bundler
 ```