libcamd2 1:5.8.1+dfsg-2build1 (armhf binary) in ubuntu impish

 Suitesparse is a collection of libraries for computations involving
 sparse matrices.
 .
 The CAMD library provides a set of routines for pre-ordering sparse matrices
 prior to Cholesky or LU factorization, using the approximate minimum degree
 ordering algorithm with optional ordering constraints.