{{lastupdated_at}} by {{lastupdated_by}} {{>toc}} h1. Debian 8 to 9 h2. Update sources list
vim /etc/apt/sources.list
:%s/jessie/stretch/g
h2. Upgrade the system h3. Check for Necessary Disk Space
apt-get -o APT::Get::Trivial-Only=true dist-upgrade
h3. Update the sources
apt-get update
h3. Minimal Upgrade
 apt-get upgrade
h3. Full Upgrade
apt-get dist-upgrade
h3. Upgrade MySQL databases (if MySQL/MariaDB installed)
mysql_upgrade
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), errors like these may be reported by backupninja:
    CRITICAL - 38 errors or warnings
May 27 01:00:03 Warning: The partition table for /dev/ram0 could not be saved.
May 27 01:00:03 Warning: The partition table for /dev/ram1 could not be saved.
May 27 01:00:03 Warning: The partition table for /dev/ram2 could not be saved.
*Resolution:* add @partitions = no@ to job 15/in @15-info.sys@. 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
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
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/