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More recent distributions use busybox for most commands, including mount. In these releases, /bin/mount is a symlink to /bin/busybox and the symlink must be named "mount", and not "mount.bin" in order to work correctly. As such, the above answer by Mskje can be changed to the following: Boot as normal to the live session. sudo rm /bin/mount sudo mkdir ...


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The only solution I am aware of is pixz (sudo apt-get install pixz), a variant of xz using a blocked encoder which allows for fast random acccess/indexing. Additionally, it is a parallel method using multiple cores for compression. Citing the docs: The existing XZ Utils ( http://tukaani.org/xz/ ) provide great compression in the .xz file format, but ...


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I con only think of one solution for you: Make a new partition, with a btrfs filesystem and activate transparent compression. Keep in mind tha some people still considder btrfs an "experimental" filesystem. That being said, my secondary backup HDD is using btrfs (for little over 2 years) and so far it's given me 0 issues. But as usual YMMV. This and this ...


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I was able to make a slight variation on your command successful using the -r300 option from @drN The -r option allows you to set the output resolution in the pdf as well as png. gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/default \ -dNOPAUSE -dQUIET -dBATCH -dDetectDuplicateImages \ -dCompressFonts=true -r150 ...


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As best as I can tell, zcache was removed from the kernel as of version 3.11: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1256503 I would recommend looking at zswap instead. It's enabled just as easily: Edit /etc/default/grub.conf GRUB_CMDLINE_LINUX_DEFAULT="quiet splash zswap.enabled=1" sudo update-grub Reboot To verify it's enabled: dmesg ...


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It is not a good idea compressing directly with 7z spcially on unix/linux systems: 7z does not preserve permissions and or user/group info. So: first tar, and then compress. As reported on 7zip wiki page at http://en.wikipedia.org/wiki/7z#Limitations : Limitations The 7z format does not store filesystem permissions (such as UNIX owner/group ...



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