Update debian-install.md

Author: noahbliss

docs/debian-install.md

@@ -5,6 +5,8 @@ Debian is a first-class development target for mortar and as such is the most th
 ## Gotcha's  
 Everyone knows the bane of Debian is old packages in the name of stability. This bites us a little with mortar.  
 
+Debian installed from the Live disk with encryption is **not** supported currently. It sets up the boot chain differently than the netinstall.  
+
 **If you are using a TPM2 module and step `3-` fails due to errors _before_ asking for your LUKS password...**  
 Run `tpm2_pcrlist` and check which banks (hash types) are being used. If _only one_ type (likely sha1 or sha256) is showing PCR values, you're probably encountering a bug in the Debian version of clevis where it complains about filesizes. My error was "ERROR: pcr-input-file filesize does not match pcr set-list"