Debian upgrade Wheezy to Jessie

Good day Guys

Here is my tip / howto to upgrade Debian Wheezy to Jessie.

I highly recommend first ensuring that your server is update.

So run:

# apt-get update

# apt-get upgrade

# apt-get dist-upgrade 

# apt-get -f install

Fix any outstanding issues. 

If all is good. You can start by changing you sources.list to reflect Jessie

sed -i 's/wheezy/jessie/g' /etc/apt/sources.list

sed -i 's/wheezy/jessie/g' /etc/apt/sources.list.d/*

The second sed is to ensure all other third pary repos reflect Jessie too.

There after you are good to go.

Run:

# rm -rf /etc/apt/preferences.d/*

# apt-get update

# apt-get upgrade

# apt-get dist-upgrade

# apt-get -f install 

This can take awhile.

After the upgrade it is recommended to reboot your system: 

# reboot

After your server has come up, for safety sake, run another 

# apt-get update

# apt-get upgrade
# apt-get -f install

You should have a new and shiny new OS, and you can verify, by using either 
hostnamectl or 
lsb_release -a

HTH
Brent