This week i decided to do some natural language processing (NLP) research which mainly involves running NLP task experiments in Ubuntu. As i was installing the required tools, i started tampering with permissions on several files including those in the root directory. Specifically, i applied chmod -R [NNN] to several directories and then suddenly many applications and functions somehow just vanished! I tried to find a solution but ended up wasting a whole evening and night! Later, i had to reinstall the latest version of Ubuntu (14.04) to have a go at my experiments ASAP. This means i have started from scratch again.
LESSON: Don't mess around with system files. apply chmod in root directory and you are very likely to have to reinstall again.
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