diff --git a/install.sh b/install.sh
index 4d00076..a0b4f21 100644
--- a/install.sh
+++ b/install.sh
@@ -24,7 +24,7 @@ if [[ -z "$FROM" ]]; then
     exit 1
 fi
 
-apt-get -y install ssmtp
+apt-get update && apt-get -y install ssmtp
 sed -i -e 's/=mail$/=mail.neshweb.net:587/' /etc/ssmtp/ssmtp.conf # replace 'mail' mailhub with actual mailserver
 sed -i -e 's/hostname=.*/hostname='"$DOMAIN"'/' /etc/ssmtp/ssmtp.conf # replace hostname with actual domain
 sed -i -e 's/#FromLine/FromLine/' /etc/ssmtp/ssmtp.conf
@@ -32,5 +32,5 @@ printf "useSTARTTLS=YES\nAuthUser=$MAILUSER\nAuthPass=$PASS\n" >> /etc/ssmtp/ssm
 printf "root:noreply@$DOMAIN:mail.neshweb.net:587\n" >> /etc/ssmtp/revaliases # alias 'root' sender to actual noreply sender to be used
 wget "https://forgejo.neshweb.net/Neshura/disk-warn-script/raw/branch/main/disk-warn.sh" -P /root -O disk-warn.sh
 chmod +x /root/disk-warn.sh
-sed -i -e 's/FROMNAME/$FROM/' /root/disk-warn.sh
+sed -i -e 's/FROMNAME/'"$FROM"'/' /root/disk-warn.sh
 (crontab -l 2>/dev/null; echo "0 1 * * * /root/disk-warn.sh") | crontab -