Thanks, I actually tried that without success:
root@siductionbox:~# apt-cache search libpng12-0
root@siductionbox:~# apt-get install libpng12-0
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libpng12-0 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 'libpng12-0' has no installation candidate
root@siductionbox:~#