diff --git a/proxmox/proxmox.template.debian.sh b/proxmox/proxmox.template.debian.sh
index 458f530..f621d37 100755
--- a/proxmox/proxmox.template.debian.sh
+++ b/proxmox/proxmox.template.debian.sh
@@ -42,6 +42,9 @@ tar xzf /tmp/latecommand.tar.gz -C /tmp/
 
 # APT {{{
 
+# ensure to install aptitude
+apt install -y aptitude
+
 # ensure to remove useless x11 packages
 aptitude remove -y x11-common libgl1-mesa-glx xauth libx11-6 libxcomposite1 libxdamage1 libxext6 libxfixes3 libxft2 libxi6 libxinerama1 libxkbfile1 libxmuu1 libxpm4 libxrandr2 libxrender1 libxv1 libxxf86dga1 libxxf86vm1 libx11-data