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So I managed to reproduce this problem by modifying my /etc/environment file to match your one line and then restarting:
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games" JAVA_HOME="/usr/lib/jvm/java-8-oracle/jre/bin/java"
to
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
JAVA_HOME="/usr/lib/jvm/java-8-oracle/jre/bin/java"
To fix this I was able to split the line in two and then restart (relog should work as well).
This seems to be a bug in either python os library or the ROS scripts usage of it as sourcing that file should work even if they are on a single line.
p.s. if your terminal can't find the commands again you can copy/paste PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" to get them back.
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