E: Package 'omxplayer' has no installation candidate

[ProBlox42R]

LOG

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package omxplayer 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 'omxplayer' has no installation candidate

[jehutting]

:-)
Have a look here #810 (comment)
It would help if you show the output of the command cat /etc/os-release