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You should try forcing the acpi-cpufreq scaling driver. To do so, edit (as sudo) the /etc/default/grub file and change the "GRUB_CMDLINE_LINUX_DEFAULT" line, adding this (and my example has some other stuff for my case that was there before): GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 intel_pstate=disable crashkernel=384M-:128M" Then run: sudo ...


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There is an extra s in your /etc/default/grub. Remove the s and save the file. After that run this: sudo dpkg --purge linux-image-3.13.0-32-generic sudo apt-get update sudo apt-get -f install


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It is not a good idea to install old versions. And Ubuntu 12.04 is slower than 14.04 on old hardware in many cases. But for your laptop I would suggest to install Lubuntu 14.04. It does not have enough RAM to work with Unity well.



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