diff --git a/README.md b/README.md
index 8c7a0d6..c415444 100644
--- a/README.md
+++ b/README.md
@@ -164,3 +164,15 @@ sudo service dphys-swapfile restart
 
 The Raspberry Pi 5 uses a kernel with 16k page-size, which is incompatible with Proxmox Backup Server (jemalloc/Rust).
 So you need to a 4k kernel on the RPi5 for Proxmox Backup Server to work.
+
+### Raspberry Pi OS `apt update && apt upgrade` failing (https://github.com/wofferl/proxmox-backup-arm64/issues/60)
+
+As Proxmos source repository does not work for ARM architecture anyway in order to keep underlying Raspberry Pi OS
+up to date by running `apt update && apt upgrade` it is required to comment it out from apt sources.
+
+```
+sudo sed -i '' 's/^\([^#]\)/#\1/g' /etc/apt/sources.list.d/pbs-enterprise.list
+
+cat /etc/apt/sources.list.d/pbs-enterprise.list
+# deb https://enterprise.proxmox.com/debian/pbs bookworm pbs-enterprise
+```