Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python3-matplotlib is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Unable to locate package python3-h5py
E: Unable to locate package python3-ipython
E: Package 'python3-matplotlib' has no installation candidate
E: Unable to locate package libhdf5-openmpi-dev~
Reading package lists... Done Building dependency tree... Done Reading state information... Done Package python3-matplotlib is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source
E: Unable to locate package python3-h5py E: Unable to locate package python3-ipython E: Package 'python3-matplotlib' has no installation candidate E: Unable to locate package libhdf5-openmpi-dev~
What is the problem?