How to migrate from Ubuntu 16.04 to 18.04?

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• Move data to new installed system (stable)

  • Prepare current data and download

  • Upload data to new server

  • Change ip address of new system to old one

  • (Optional)How to move back

• Update Ubuntu 16.04 to 18.04 (unstable!)

  • Make Update to new release (18.04)

  • Prepare the updated system

  • Download and run re-installation script

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Download script from GitHub:

cd ~; wget https://github.com/tacacsgui/tgui_install/releases/download/tgui_install/tgui_migration.zip

Unzip and make it executable:

unzip tgui_migration.zip; chmod u+x tgui_migration.sh;

Run it:

./tgui_migration.sh

If you finally see “done”, data was saved succesfully, please move to the next step

Open web interface and move to System Backup -> Full Backup tab:

Download file with version number 777.

Never mind how do you install new server by ISO or OVA.

Open web interface (of new server) and move to System Backup -> Full Backup tab:

Upload file and click Restore. Then Apply Settings and make fast check.

Shutdown the old server or change ip address

Now you are ready to change ip address of the new server to old one

Move to Administration -> API Settings -> Network tab

I hope it will be happy end for you and won’t go to the next step.

If something was going wrong, please switch to old server

All you have to do is run sudo apt update; sudo apt full-upgrade -y; and then sudo do-release-upgrade.

It is a very boring process, just say “yes” every time when you can.

I have met some issues after update and offer some decisions:

Fix source.list, sudo nano /etc/apt/sources.list, just add lines below to the end of file:

deb http://us.archive.ubuntu.com/ubuntu/ xenial universe
deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted
deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

Fix Pip:

sudo apt remove pip pip2 pip2.7 pip3 pip3.5 -y

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py

sudo python3 get-pip.py --force-reinstall

Reinstall tac_plus daemon:

sudo rm /usr/local/sbin/tac_plus

Hope it resolve all issues:

cd ~; sudo rm -r tgui_install*; wget https://github.com/tacacsgui/tgui_install/releases/download/2.0.1/tgui_install.tar.gz

mkdir tgui_install; tar -xvf tgui_install.tar.gz -C ~/tgui_install/ --strip-components 1; cd ./tgui_install

sudo chmod 755 ./tacacsgui.sh ; sudo ./tacacsgui.sh silent

And finally, restart the tac_plus daemon

sudo service tac_plus stop; sudo service tac_plus start; sudo service tac_plus stop;