ubuntu 14.04 to 16.04 upgrade notes

ubuntu 14.04->16.04 upgrade.md

Useful pages:

• https://www.digitalocean.com/community/tutorials/how-to-upgrade-to-ubuntu-16-04-lts

• http://www.tecmint.com/upgrade-ubuntu-14-04-to-16-04/

• Back up your system.

• At a minimum get a good backup of /etc/.

  • tar cvfz etc.tar.gz /etc

• stop chef-client

• review /etc/apt/sources.list.d and disable any not needed/wanted for upgrade process.

• make sure apt is willing to let you do an lts upgrade by checking /etc/update-manager/release-upgrades and twiddling Prompt=lts if needed.

apt update
apt upgrade
apt-get autoremove

• make sure /boot has enough free space to install a new kernel. clean up old/spare kernels if you don't have enough space. You'll regret it if you don't double check it - it is recoverable if you are careful but why hurt yourself.

• Launch a tmux do-release-upgrade

• Take note at start when it creates a new ssh server for you.

• On a seperate machine start another tmux and ssh into that new ssh server port

• you may need to disable/open firewall to allow this to work. Keep that in the background incase things go sideways.

Good luck

Success? minor clean up steps:

rm /etc/apt/apt.conf.d/50unattended-upgrades.ucf-old
apt remove upstart
rm /etc/X11/Xsession.d/*upstart* 

---

too many kernels | full /boot

Find any kernels you are not running and remove them

dpkg --list | grep linux-image | grep -v `uname -r` | grep -v linux-image-generic | awk '{print $2}'

It might be handy to redirect that output to a rm_kerns file and then doing the following dance:

for I in `cat rm_kerns | grep extra`; do dpkg -P $I; done
for I in `cat rm_kerns | grep -v extra`; do dpkg -P $I; done

That should free up space on /boot allowing you to do the normal apt-get update && apt-get autoremove dances for proper cleaning.