# Easy chart calculated pens and Ubuntu

**URL:** <https://forum.inductiveautomation.com/t/easy-chart-calculated-pens-and-ubuntu/5970>\
**Category:** Ignition\
**Created:** [March 5, 2013, 5:32pm UTC](https://forum.inductiveautomation.com/t/easy-chart-calculated-pens-and-ubuntu/5970 "2013-03-05T17:32:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![2Gi\_Technologie](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/2gi_technologie/32/3307_2.png) [@2Gi\_Technologie](https://forum.inductiveautomation.com/u/2Gi_Technologie)\
**Post date:** [March 5, 2013, 5:32pm UTC](https://forum.inductiveautomation.com/t/easy-chart-calculated-pens-and-ubuntu/5970/1 "2013-03-05T17:32:00Z")

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Hi all,

we seem to encounter a problem with Easy chart calculated pens and Ubuntu.  
Both in the designer and under the application, if we check, unckeck, and check again a calculated pen, the application go out without any error…  
This kind of problem seems to be linked to Ubuntu. The same actions are working under Windows.

Our Versions:  
Ignition : 7.5.5 (b1255)  
Java : 1.6.0\_27  
Ubuntu : 12.04

Thanks

Regards

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**Author:** ![Travis.Cox](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@Travis.Cox](https://forum.inductiveautomation.com/u/Travis.Cox)\
**Post date:** [March 7, 2013, 7:40pm UTC](https://forum.inductiveautomation.com/t/easy-chart-calculated-pens-and-ubuntu/5970/2 "2013-03-07T19:40:47Z")

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Yes, we have seen this problem when using Java 6 or when you have Java 6 and Java 7 installed on the same machine. On the machine where you launch the client, just install Java 7 and it should be just fine.

The problem actually crashes the client. So try Java 7 and let us know.