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= HowTo > JOSM-under-Linux

== Getting the ALT key working ==
If your window manager use the `Alt` key as modifier key some combination within JOSM do not work.
* You need to change the modifier key in your window manager preferences to some other key
 * For **KDE** you may want to modify the `Alt` key behaviour:

  Open Control Center --> Desktop --> Window Behaviour --> Actions

* Otherwise you can use right alt key {{{Alt Gr}}} only.

== Java Virtual Machine ==
When using Ubuntu with Gnome you could install JOSM from the [/Download#Ubuntu repository]. If you haven't installed java please do so. Then you could start JOSM in the bash with the command josm. Sometimes there is an error like this:

{{{
  No valid JVM found to run JOSM.
  Please install one of those mentioned in README.Debian
  or set the JAVACMD environment variable prior running josm.
}}}

You have to make a symbolic link in the folder `/usr/local/bin/` like this:

{{{
#!sh
sudo ln -s /usr/bin/java /usr/local/bin/jamvm
}}}

Now you should be able to start JOSM.

If you use Ubuntu older than 12.10, consider the possibility that you are experiencing the bug [https://bugs.launchpad.net/ubuntu/+source/josm/+bug/1186377 #1186377]. A workaround is described on ticket #8279.

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