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Compressing part of filesystem a second time

I have a laptop running Ubuntu 11.10. I've replaced the HDD with a 120GB SSD, and to save some precious disk space I utilized one of Steve Hanov's tips for optimizing Ubuntu to run on a USB key or SD ...
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1answer
657 views

“Unknown filesystem unionfs” although all packages and modules are installed

I'm trying to mount a unionfs file system in fstab (as one of the steps in this guide), with the following line: unionfs /usr unionfs nodev,noatime,dirs=/.filesystems/usr/overlay=ro:/usr=rw 0 0 ...