After long time I’m posting this. In this time, I got a fantastic experience of switching myself from ubuntu to debian. Reasons? may be silly but here they are… More here
1. From 8.10, I had a tough time with all the kernel’s ubuntu shipped and updated into my laptop, I was hit by a kernel acpi bug (http://bugzilla.kernel.org/show_bug.cgi?id=11727) which still exists(in i686, not in x86_64). It pauses boot process when my laptop runs in battery and I need to press until init starts.