One thing about Ubuntu and Mint on the ZG5s (A110 and A150) - it needs (needed?) a bit of tweaking to recognize an SD card inserted after booting. See this post
. Fedora kernels don't need this - they have the pciehp module compiled into the kernel by default. However, this should not be the criterion by which you decide on one vs. the other.
Installing over your crashed Linpus shouldn't be a problem. However, you might want to boot off the live USB stick and save any valuable data in your Linpus /home directory before installing Ubuntu.