[ubuntu] "Startup Applications" doesnt work

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http://ubuntuforums.org – I tried to open my skype app with another preloader package at startup, adding this command to "startup applications": LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l1compat.so skype but unfortunately it doesn't work. However other commands like skype without preloader work properly. I would be thankful if any could help me with this problem. (Hardware)