Why “remove Ubuntu 12.04 and replace it with Ubuntu 13.10” means to use all of the disk and lose all data?

Why do you not have a backup of the data?
What if the drive IDE or motor fails. Where is your data?

actionparsnip is that really an answer for this ?

since when MY DATA ON A SEPARATE NTFS PARTITION IS PART OF UBUNTU ? does "REPLACE UBUNTU" MEAN TO OVERWRITE PARTITIONS THAT ARE NOT PART OF THE UBUNTU OPERATIONAL SYSTEM ?

I always format the OPERATIONAL SYSTEM PARTITION and NEVER TOUCH THE DATA PARTITION making it posible to swith to another operational system without the need of a BACKUP ..and that is exactly what I expected from the REPLACE UBUNTU

I hope next comment or answer is a more constructive and related to what I am asking/suggesting

Yes if your data is important why is there no backup? Having a separate data partition does not negate the necessity of a backup, it only makes it easier.

You can look in to foremost and you will need another drive mounted writable of greater or equal size to the source. You will lose directory and file name data but atual file may be restored. If the space that files occupied on the drive has been overwritten then the file is GONE and is 100% irretrievable.

a cheap USB HDD makes this a LOT easier and you could simply reinstate your data, but you don't have one (for reasons known only to yourself) so now your so called 'important' data hangs in the balance.

actionparsnip am I asking what do I need to perform a backup or why a backup is important ?

What I am asking or suggesting is to improve a SIMPLE TEXT on an installer I dont need to be lecture about backup importance

I guess attitudes like "is always the user fault" that makes normal and regular people to stay away from linux and other kind of software that is made by people that believe are perfect.

What is the point of having a FORUM or place to ASK QUESTIONS if you this is the quality of the interactions in here

status ANSWERED....hahaha...that must be a JOKE.....!!

Try rereading my last reply. I actually suggested a solution. Nice attitude by the way.

actionparsnip I dont seen anything that explains that REPLACING AN OPERATIONAL SYSTEM means also REMOVING A PARTITION WHERE NOT A SINGLE UBUNTU FILE IS LOCATED

Again DO YOU THINK THAT LECTURING ABOUT BACKUPS TO SOMEONE WHO IS STILL RECOVERING HIS DATA IS A NICE ATTITUDE ?

Unfortunately, ranting would not solve the actual problem here: you don't have a backup of your data. If you had one you wouldn't be going through this.

See it one way or another, it's done. What do you want us to do? Patches are welcome, by the way.

I am not asking you to RECOVER MY DATA. I am asking you to CHANGE A TEXT IN THE INSTALLER TO MAKE IT CLEAR THAT ALL THE HARD DRIVE WILL BE USED WHEN THE "REPLACE UBUNTU" OPTION IS SELECTED...tell me how to fix this and I will submit the patch..no problem

I suggest you report a bug

I think the right answer is

THERE IS ALREADY A REPORTED BUG THAT HAS AFFECTED AT LEAST 3 USERS

See https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1265192