apt-get command

I have the following message whenever I use the apt-get command under Debian or Ubuntu Linux:

The following packages were automatically installed and are no longer required:
libaccess-bridge-java libjs-mochikit python-cheetah libjs-excanvas
libaccess-bridge-java-jni sabnzbdplus-theme-smpl tzdata-java
ca-certificates-java
Use ‘apt-get autoremove’ to remove them.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.

How do I fix this issue? Is it safe to remove all unwanted packages?

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