How to locate Linux package?
How to locate Linux package?
```sh
sudo updatedb
locate eigen3
```
For example:
```sh
/usr/include/eigen3
/usr/include/boost/compute/interop/eigen
/usr/include/boost/compute/interop/eigen.hpp
/usr/include/boost/compute/interop/eigen/core.hpp
/usr/include/boost/numeric/odeint/external/eigen
/usr/include/boost/numeric/odeint/external/eigen/eigen.hpp
/usr/include/boost/numeric/odeint/external/eigen/eigen_algebra.hpp
/usr/include/boost/numeric/odeint/external/eigen/eigen_algebra_dispatcher.hpp
/usr/include/boost/numeric/odeint/external/eigen/eigen_resize.hpp
/usr/include/eigen3/Eigen
/usr/include/eigen3/signature_of_eigen3_matrix_library
/usr/include/eigen3/unsupported
/usr/include/eigen3/Eigen/Cholesky
/usr/include/eigen3/Eigen/CholmodSupport
/usr/include/eigen3/Eigen/Core
/usr/include/eigen3/Eigen/Dense
/usr/include/eigen3/Eigen/Eigen
/usr/include/eigen3/Eigen/Eigenvalues
/usr/include/eigen3/Eigen/Geometry
/usr/include/eigen3/Eigen/Householder
/usr/include/eigen3/Eigen/IterativeLinearSolvers
/usr/include/eigen3/Eigen/Jacobi
/usr/include/eigen3/Eigen/LU
/usr/include/eigen3/Eigen/MetisSupport
/usr/include/eigen3/Eigen/OrderingMethods
/usr/include/eigen3/Eigen/PaStiXSupport
/usr/include/eigen3/Eigen/PardisoSupport
/usr/include/eigen3/Eigen/QR
/usr/include/eigen3/Eigen/QtAlignedMalloc
/usr/include/eigen3/Eigen/SPQRSupport
```
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