Prevent specific packages from installed in apt

/etc/apt/preferences

Package: xfce4-power-manager
Pin: release *
Pin-Priority: -1

Package: xfce4-power-manager-data
Pin: release *
Pin-Priority: -1

root@misaka:~# apt install xfce4-power-manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package xfce4-power-manager 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
However the following packages replace it:
  xfce4-power-manager-data

E: Package 'xfce4-power-manager' has no installation candidate
root@misaka:~# apt install xfce4-power-manager-data
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package xfce4-power-manager-data 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: Package 'xfce4-power-manager-data' has no installation candidate

• https://askubuntu.com/questions/75895/how-to-forbid-a-specific-package-to-be-installed