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Set ANT_OPTS on Ubuntu

1. See the error :  Please set the environment variable ANT_OPTS to the recommended value of "-Xmx1024m -XX:MaxPermSize=512m".

2. It recommend you a value "-Xmx1024m -XX:MaxPermSize=512m"

3. Open terminal and execute
    sudo nano .bashrc [open .bashrc file in edit mode]

4. Add this two lines at the end of the file
    ANT_OPTS="-Xmx1024m -XX:MaxPermSize=512m"
    export ANT_OPTS
 
5. Now save the file.

6. source .bashrc

Note:
Don't do that using "fish" or other terminal. Always use Ubuntu default terminal.
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