A month ago, I launched the installation of Kubuntu on an external drive connected to my MacBook Intel Core 2 Duo (Tiger 10.4.11) but the Ubuntu bootable cd is ejected before the end of the installation and since at every boot, my Mac can not find the operating system: file flashing question mark.
I did not backup my data (mostly photos) thinking that if I do not install anything on the internal drive, I did not risk anything.
I used the disk utility from my installation CD 1, which informs me that the internal drive (formatted HFS) is in good condition and does not need repair (disk permissions are grayed out and I've no access), in contrast to the external drive (500 GB) which is running Kubuntu "The underlying task reported failure to close" and it needs to be repaired.
Since I gave my mac to Apple Authorized Service Center, they told me that the hard disk is formatted (but I still have the ability to retrieve something and how).
I do not understand how Kubuntu could erase all my data when I have not formatted or partitioned hard drive on my mac.
I do not lose hope to recover my photos, or at least to understand "why and how" with your help because I need to know what could happen.