Hi! You're lucky enough to have stumbled onto this link.
Here's what you do:
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Uninstall previous virtualboxes
sudo apt remove virtualbox-5.0
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Download one of the virtualbox 5.0s such as 5.0.38 from the virtualbox site. The xenial will do.
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Now install it like this:
sudo dpkg -i --ignore-depends=libvpx3 virtualbox-5.0_5.0.38-114632-Ubuntu-xenial_amd64.deb
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Make sure you have libvpx4 installed:
sudo apt-get install libvpx4
For step #5 you have two options:
5a. Downloand/install vpx3 manually. It's at:
http://packages.ubuntu.com/xenial/amd64/libvpx3/download
sudo dpkg -i libvpx3_1.5.0-2ubuntu1_amd64.deb
5b. Link libvpx4 to libvpx3:
cd /lib/x86_64-linux-gnu/
ln -s libvpx.so.4.1.0 libvpx.so.3
That's it! ft