Reinstall 16.04 and keep /home

[marciano#1]

I already have installed 16.04 in a disk live DVD had formatted (three partitions, one small in FAT32, another SWAP and the large one EXT4).
/home is in the same partition as system
I want to reinstall the system.
From a live DVD

Checked Download updates....
Checked Install third-party....

Continue

Selected 'Something else' because the option 'Erase ubuntu and reinstall' erases everything (photos, music... are in /home)

The Disk is /dev/sdb

free space 1MB
/dev/sdb1 fat32 536MB 33MB used
/dev/sdb2 ext4 491044MB 186354MB used
/dev/sdb3 swap 8522MB unknown
free space 1MB


Selected /dev/sdb2 ext4
Device for boot loader installation: Selected the same but I got this message:
No root file system is defined.
Please correct this from the partitioning menu

I don't have that partitioning menu to set the Mount Point at this point of installation.

What to do?
Thanks

Edit 1: I belIeve I got it: In Edit partition despite the disk is already formatted as ext 4 I have to set again "Use as -Ext4..." After that, Mount point is displayed
Edit 2: I don't know how to mark this post as SOLVED

[TheFu]

See the "thread tools" above? Help us out, please.