When trying to launch Minecraft, you may notice that the key-input is not working properly, leading to a character that cannot move but only interact with blocks around him.
This issue is related to ibus, which is used as a character input client for Chinese, Japanese and Korean among others.
In order to solve that, you need to kill ibus during the time Minecraft is launched.
I think you already downloaded the game client minecraft.jar from dedicated website. Then save it in a folder called $FOLDER. Here $FOLDER=$HOME/bin/java.
Then use this script to launch minecraft.
#This is here to solve issues with key input in linux systems
#Kill the ibus daemon
java -Xmx1024M -Xms512M -cp $HOME/bin/java/minecraft.jar net.minecraft.LauncherFrame &
#Then wait for minecraft to finish before relaunching ibus.
You can still use character input as normal in other windows or terminals.
What is also possible is to create an application launcher on a panel launching this script, and then you can directly launch minecraft without going through a terminal.