First of all, many thanks to everyone who has been working on distribution packaging of sagemath!
It is a Cython package that has sagelib as a dependency; it can be installed on top of various distributions of sage to provide the COIN-OR CBC solver as a MixedIntegerLinearProgram backend. Though many distributions package cbc, as far as I know, the backend (sage.numerical.backends.coin_backend.CoinBackend) is not provided by any distribution. This may be in part because of COIN-OR's incompatible free software license.
In the course of testing the new package on various distributions, I have come across various distribution bugs and inconsistencies. Resolving them would make it easier for package authors to ensure that their packages install and work properly on distributions providing sage.
I have documented the issues that I encountered in comments in the following files:
I will not file separate distribution bug reports.