Given the circumstances, a lot of people without much software experience will be reading this message and simply copying and pasting; it's worth getting it right.
On Ubuntu, you'll probably want to ./configure --prefix=/usr/bin . If you install in /usr/local/bin (the default), bash will effectively no longer be updated by apt-get.
Roads are (mostly) not free, and also cost millions of (insert currency unit here) which are covered by taxes. In particular, the asphalted road in a residential street occupied without charge by someone's expensive vehicle is being paid for by, among other people, me -- and as a non-car-owner, I gain essentially no benefit from the provision of this parking space. So clearly, we've opted as a society for subsidizing public services -- but only certain services.
Once upon a time, distributions documented their build configurations. Or maybe it's that I used to only use FreeBSD.