can an update over write java in /usr

[C de-Avillez]

On 02/08/2011 05:25 AM, Tapas Mishra wrote:
> I observed that
> 	One week before the
> 	JAVA_HOME was /usr/lib/jvm/java-6-sun-1.6.0.20
> 
> 	While today in the process of debugging this problem I notice that
> there is no such 	directory
> 
> 	/usr/lib/jvm/java-6-sun-1.6.0.20
> 	where as this did existed before doing any apt-get update
> 
> 	Seems any update of Ubuntu has over written this.(Not sure of this though)

You can look at /var/log/apt. One interesting file there is the
history.log, showing what was done, and when. The term.log shows
what happened on each apt-get run.

> 
> So is it possible that if a new version of Java is available in some
> update it over writes my installation.

Yes, it is -- both possible and probable, if any such update was
available. But you can pin a package to a certain version.

> If that being the case how can I go back to the previous version it
> does not exist there any more.

Perhaps on the original install CD? Another option is to rebuild it.
But it will take a while, Java is a monster.

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