installation: add note about memtest86+ incompatibility with secureboot

Signed-off-by: Christoph Heiss <c.heiss@proxmox.com>

diff --git a/pve-installation.adoc b/pve-installation.adoc
index ccb32bee4141d3127d14501f7131b97f00945eed..6e011fa7391ca1af3283c7fb23e06f134be6845a 100644 (file)
--- a/pve-installation.adoc
+++ b/pve-installation.adoc
@@ -120,7 +120,8 @@ from the disk.
 Advanced Options: Test Memory (memtest86+)::
 
 Runs `memtest86+`. This is useful to check if the memory is functional and free
-of errors.
+of errors. Secure Boot must be turned off in the UEFI firmware setup utility to
+run this option.
 
 [thumbnail="screenshot/pve-select-target-disk.png"]