Update install.sh to use Snapd version of Certbot

install.sh

@@ -65,7 +65,13 @@ if [ 0 -eq $? ]; then
   fi
 fi;
 
-apt update -y && apt install -y python3 python3-pip certbot && pip3 install dnslib
+# Use snap version of Certbot because APT-version is too old.
+snap install --classic certbot
+snap refresh certbot
+ln -s /snap/bin/certbot /usr/bin/certbot
+
+apt update -y && apt install -y python3 python3-pip && pip3 install dnslib
+
 mkdir -p /usr/local/collaborator/
 cp "$SRC_PATH/dnshook.sh" /usr/local/collaborator/
 cp "$SRC_PATH/cleanup.sh" /usr/local/collaborator/
@@ -91,7 +97,7 @@ read -p "Press enter to continue"
 # The first step requests the actual wildcard with *.domain.com (all subdomains) certificate.
 # The second step expands the certificate with domain.com (without any subdomain).
 # This used to be possible in single-step, however currently it can lead to invalid TXT-record error,
-# as certbot starts the dnshooks concurrently and not consecutively.
+# certbot as starts the dnshooks concurrently and not consecutively.
 certbot certonly --manual-auth-hook "/usr/local/collaborator/dnshook.sh $MYPRIVATEIP" -m $EMAIL --manual-cleanup-hook /usr/local/collaborator/cleanup.sh \
     -d "*.$DOMAIN" \
     --server https://acme-v02.api.letsencrypt.org/directory \