[Installer] Add libonig(4/5) dependency

install/hst-install-ubuntu.sh

@@ -44,7 +44,7 @@ software="apache2 apache2.2-common apache2-suexec-custom apache2-utils
     postgresql postgresql-contrib proftpd-basic quota roundcube-core
     roundcube-mysql roundcube-plugins rrdtool rssh spamassassin sudo hestia
     hestia-nginx hestia-php vim-common vsftpd whois zip acl sysstat setpriv
-    ipset"
+    ipset libonig4"
 
 # Defining help function
 help() {
@@ -803,6 +803,7 @@ if [ "$release" = '16.04' ] || [ "$release" = '20.04' ]; then
 fi
 if [ "$release" = '20.04' ]; then
     software=$(echo "$software" | sed -e "s/rssh//")
+    software=$(echo "$software" | sed -e "s/libonig4/libonig5/")
 fi