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h1. Debian 8 to 9

h2. Update sources list

<pre>
vim /etc/apt/sources.list
</pre>

<pre>
:%s/jessie/stretch/g
</pre>

h2. Upgrade the system

h3. Check for Necessary Disk Space

<pre>apt-get -o APT::Get::Trivial-Only=true dist-upgrade</pre>

h3. Update the sources

<pre>
apt-get update
</pre>

h3. Minimal Upgrade

<pre> apt-get upgrade</pre>

h3. Full Upgrade

<pre>
apt-get dist-upgrade
</pre>

h2. Common problems

h3. iBackup

PT ticket #35194-19

header.pl and constants.pm are in the ibackup directory but perl on debian does not look in the local directory for @INC.
to fix copy both header.pl and constants.pm into /etc/perl/

h3. backupninja

until backupninja gets the fixes pushed out to the debian repo PT ticket #35353
add @partitions = no@ to job 15

h3. samba-ad-dc

if Samba is in AD-DC mode, it and winbind fail.
do these commands, then try to run the upgrade again

<pre>
systemctl stop smbd nmbd winbind
systemctl disable smbd nmbd winbind
systemctl unmask samba-ad-dc
systemctl start samba-ad-dc
systemctl enable samba-ad-dc
</pre>

https://lists.samba.org/archive/samba/2017-July/209972.html

h3. Removing old versions of interpreters. 

PHP5 (and Ruby 2.1) are not removed by default and will still be used if loaded! 
If there is no need for these things to exist remove them with apt-get uninstall. 

https://www.howtoforge.com/tutorial/how-to-upgrade-debian-8-jessie-to-9-stretch/