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Reading package lists... Done
Building dependency tree
Reading state information... Done
Package sun-java6-jdk 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 sun-java6-jdk has no installation candidate
Distribution: pclos2016 CentOS6.9 CentOS7.3 + 50+ other Linux OS, for test only.
Probably : # apt-get -f install && apt-get update
.. to be able to install packages again.
Next : ls -l /etc/alternatives/ | grep opt
And then remove the link / links pointing to the alien java* in /opt/.
Now it should be possible to install : # apt-get install sun-java6-jdk
Hopefully the correct links will be made in /etc/alternatives,
making it possible for # 'update-alternatives --config java'
to select "/ust/lib/jvm/java-6-sun/jre/bin/java".
( Or see, that it has been set already by the install of sun-java6-jdk.)
(( Can be checked with 'java -version' too.))