By release of new ISOs in version 10.6 I decided to reinstall Debian on a new partition, as the previous installation is from version 8.
Let's look at the steps.
You need to define your location on the map by clicking on Greece (or wherever you want) and click Next
Set the keyboard to English, then we will put the Greek and click on Next
Immediately after you need to set the user and password. The new installer has no option for root password, and you must set it via terminal immediately after installation (sudo passwd root).
On the next screen you will see the partitions of your computer, if you have any. The options given to you by the installer are 4:
Replace a partition: to replace a partition (you already have an operating system, it will be replaced with .Debian). It works as long as you are sure you want to do it.
Erase disk: Delete the disc and
Manual partitioning: It is the option I will use. I will select a partition of my disk and install the operating system.
Then I choose sda1 where the boot files of the operating systems I use already exist. So I don't choose Format but keep, and as mount point I give it /boot/efi.
You may need to add a swap partition. In my installation the swap already exists from others distributions, so I choose keep and not format so that the UUID in the partition does not change and present problems to the installed distributions.
You can then select Next to go to the confirmation screen.
If you agree, select Next and the installation will begin.
Τα νέα Live DVD της διανομής περιέχουν και μια ρύθμιση που δεν υπήρχε παλαιότερα. Ο εγκατάστάτης θα σας ζητήσει ένα κωδικό για την εφαρμογή kdewallet, αλλά και τον τρόπο κρυπτογράφησης των data σας. Επέλεξα blowfish έδωσα ένα password και η εγκατάσταση προχώρησε
The installation is complete. But I have to display the distribution in the existing grub menu. So I boot with the Manjaro distribution that I use only for Grub Menu, because it shows the system from which I requested the reboot.
As you can see in sda12 is the new installation. The grub-mkconfig -o /boot/grub/grub.cfg command found the new installation and added it to the grub menu.
We are ready. All that remains is to install the applications I use and then copy the settings from the older distribution (see sda6).
To do this read: Linux and home directory: what you need to know