On doing an upgrade from 10.10. to 11.04 using Upgrade Manager everything works fine. But on installing a software that bundle its owns runtime environment( loader and system files) and installs the custom runtime ( basically loader) in the location where the native one resides, the above mentioned upgrade fails.(Upgrade starts and after sometime it encounters an error and aborts.)

Basically , /usr/bin/dpkg throws up an error on being unable to locate a system shared library in the aforesaid third party runtime folder ( /usr/bin/dpkg should not search the third party runtime folder.Instead it should look at the system default folder)

But if we remove the installed third party loader from the default system location /lib and place it in some other location , the upgrade problem goes away.

This makes me believe /usr/bin/dpkg invokes(loads) the wrong loader and as such goes looking for the dependent libraries in the third party folder.

Can someone take a look at this ? is there some bug with dpkg