Hello, I am quite in trouble about one main HDD tripartioned as ext4, NTFS and HFS+.
Each partition was bootable, managed by the GRUB system.
At first the Chamaleon Bootloader failed starting the MacOs partition, then after I reinstalled the boot1h in my Mac partition (/dev/sda1, whole HDD is /dev/sda), as expected I got a Boot0 error... But when I booted from a live Ubuntu dvd, with surprise I noticed all different partitions were lost now turned into unallocated space.

My idea is to run an application like get data back to retrieve my files, however I don't know if it will be enough due to the three different filesystem on my Disk.

Thanks in advance for any suggestions.

Can you show us the Partitions window in DMDE? Depending on the problem, there may be a simple DIY fix.

https://dmde.com/

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A backup a day keeps DR away.

Thank you very much, I read it only now and this program seems indeed what I was looking for.
Luckily I tried with a Ubuntu live dvd (I'm not much into windows OS) and testdisk was able to fix the tables
Now the disk is ready for r/w and apparently every data is in place.

Now I'm trying to repair the boot part and see if I can run my OSs back.

About this, again, every suggestion will be very welcome.

Thank you so much again