Merge pull request #299 from s41m0n/support/UbuntuFocalFossa

Modified golang-go dependency to support Ubuntu 20.04

Documentation/installation.rst

@@ -72,6 +72,13 @@ Install GO
 
 Go 1.8+ is needed to run ``polycubectl``, if you only plan to install ``polycubed`` you can skip this step.
 
+Since Ubuntu 20.04, support for ``golang-go`` has been introduced into the main repositories. Thus, you just need to run
+
+::
+	sudo apt install golang-go
+
+Instead, for all the previous versions (< 20.04) please refer to the following instructions:
+
 ::
 
     # If you are running a previous Ubuntu version, you could add the

scripts/pre-requirements.sh

@@ -8,8 +8,14 @@ mkdir -p $WORKDIR
 $SUDO apt update
 $SUDO bash -c "apt install --allow-unauthenticated -y wget gnupg2 software-properties-common"
 
-# golang v1.12 still not available in repos
-$SUDO add-apt-repository ppa:longsleep/golang-backports -y || true
+os_limit="20.04"
+os_version=`cat /etc/os-release | grep -Po 'VERSION_ID="\K.*?(?=")'`
+
+# golang v1.12 still not available in repos for Ubuntu versions < 20.04
+if (( $(echo "$os_version < $os_limit" | bc -l) ))
+then
+  $SUDO add-apt-repository ppa:longsleep/golang-backports -y || true
+fi
 
 $SUDO apt update
 PACKAGES=""