Add support for ubuntu 18.04

config/openbox/environment

@@ -1 +1 @@
-export PATH="$HOME/.local/share/clopper-ob/bin:$HOME/.local/share/clopper-ob/notify-send.sh:$PATH"
+export PATH="$HOME/.local/share/clopper-ob/bin:$HOME/.local/share/clopper-ob/applications/notify-send.sh:$PATH"

setup.bash

@@ -22,7 +22,8 @@ install-apt-dependencies() {
 	     dunst \
 	     numix-icon-theme-circle \
 	     vorbis-tools \
-	     sound-theme-freedesktop
+	     sound-theme-freedesktop \
+	     terminator
     set +x
 }
 
@@ -39,7 +40,7 @@ asset-dirs-exist() {
 
 install-dependencies() {
     echo "=> Checking dependencies"
-    if ! are-in-path xcompmgr openbox dunst ogg123 || ! asset-dirs-exist; then
+    if ! are-in-path xcompmgr openbox dunst ogg123 terminator || ! asset-dirs-exist; then
 	install-apt-dependencies
     fi
 
@@ -47,7 +48,7 @@ install-dependencies() {
     notify_send_dir="$(local-dir)/applications/notify-send.sh"
     if ! [[ -d "$notify_send_dir" ]]; then
 	mkdir -p "$notify_send_dir"
-	git clone git@github.com:vlevit/notify-send.sh.git "$notify_send_dir"
+	git clone git@github.com:vlevit/notify-send.sh.git "$notify_send_dir" || rm "$notify_send_dir"
     fi
 }
 
@@ -93,21 +94,35 @@ add-custom-startup() {
 }
 
 ppa-has-been-added() {
-    declare ppa="$1"
+    declare -r ppa="$1"
-    grep -q "^deb .*$ppa" /etc/apt/sources.list /etc/apt/sources.list.d/*
+
+    if [[ $ppa == ppa:* ]]; then
+	ppa-has-been-added "${ppa#ppa:}"
+	return $?
+    fi
+
+    grep -q "$ppa" /etc/apt/sources.list /etc/apt/sources.list.d/*
 }
 
 add-ppa-if-not-added() {
     declare ppa="$1"
     if ! ppa-has-been-added "$ppa"; then
 	printf 'Adding ppa "%s"\n' "$ppa"
-	sudo add-apt-repository "ppa:$ppa"
+	sudo add-apt-repository "$ppa"
     fi
 }
 
+os-is-ubuntu-1804() {
+     [[ $(cat /etc/os-release | grep VERSION_ID | grep -qPo '(?<=").*(?=")') == '18.04' ]]
+}
+
 add-ppas() {
-    add-ppa-if-not-added 'nilarimogard/webupd8'
+    if os-is-ubuntu-1804; then
-    add-ppa-if-not-added 'numix/ppa'
+	add-ppa-if-not-added 'deb http://download.opensuse.org/repositories/home:/manuelschneid3r/xUbuntu_18.04/ /'
+    else
+	add-ppa-if-not-added 'ppa:nilarimogard/webupd8'
+    fi
+    add-ppa-if-not-added 'ppa:numix/ppa'
 }
 
 cache-dir() {