How to reinstall Ubuntu without losing programs and data?

Question

linux

Hello! Tell me how to reinstall Ubuntu without losing programs, configs and data (photos, documents, etc.)?
System and documents are stored on the same hard drive:
/dev/sdb drive: 55.9 GiB, 60022480896 bytes, 117231408 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I /O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk ID: 0xd04cd0b5 Device
Boot Start End Sectors Size Id Type
/dev/sdb1 2048 102694911 102692864 49G 83 Linux
/dev/sdb2 102696925 11 7G 5 Advanced
/dev/sdb5 102696960 117229567 14532608 7G 82 Linux swap / Solari

Answer 1

Make a backup of home.
You will lose only those programs and configs that were installed and changed outside of it.
If you want to save them, then make backups of the necessary configs.

Answer 2

just do not format the partition and
during installation you choose another one, mount the old partition and put the checkbox on top of
the main checkbox, remove the format
in the installer itself, you can search for incompatible packages