installation-guide: add warning about the use of LVM partition types

2 files changed, 12 insertions, 1 deletions

diff --git a/debian/changelog b/debian/changelog
index 82baab390..d18f67e44 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -12,6 +12,7 @@ installation-guide (20180604) UNRELEASED; urgency=medium
   * Document how to install additional packages afterwards. Closes: #615646
   * Improve/update documention regarding booting from USB storage. 
     Closes: #756859
+  * Add a warning about the use of LVM partition types. Closes: #776313
 
   [ Frans Spiesschaert ]
   * Keep Dutch translation up-to-date
diff --git a/en/using-d-i/modules/partman-lvm.xml b/en/using-d-i/modules/partman-lvm.xml
index 89b32b958..0f320ba21 100644
--- a/en/using-d-i/modules/partman-lvm.xml
+++ b/en/using-d-i/modules/partman-lvm.xml
@@ -41,7 +41,17 @@ to be used as physical volumes for LVM. This is done in the
 <menuchoice> <guimenu>Use as:</guimenu> <guimenuitem>physical volume
 for LVM</guimenuitem> </menuchoice>.
 
-</para><para>
+</para><warning><para>
+
+Be aware: the new LVM setup will destroy all data on all partitions marked with
+an LVM type code. So, if you already have an LVM on some of your disks, and
+want to install Debian additionally to that machine, the old (already existing)
+LVM will be wiped out! The same counts for partitions, which are (for any
+reason) misleadingly marked with an LVM type code, but contain something
+different (like an encrypted volume). You need to remove such disks from the
+system, before performing a new LVM setup!
+
+</para></warning><para>
 
 When you return to the main <command>partman</command> screen, you will see
 a new option <guimenuitem>Configure the Logical Volume Manager</guimenuitem>.