Add some Linux installation pages

installation-linux-edgeos.md

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+---
+tags: dontlink
+sitemap: true
+---
+
+# Installing on Ubiquiti EdgeOS
+
+Yggdrasil is supported on the Ubiquiti EdgeRouter using the
+[vyatta-yggdrasil](https://github.com/neilalexander/vyatta-yggdrasil) package.
+
+Perform installation steps over SSH by connecting to the EdgeRouter as the
+`ubnt` user, e.g. `ssh ubnt@192.168.1.1`, or another admin-level user if
+configured.
+
+### Package install from an Aptitude repository
+
+Start by adding the GPG key:
+```
+curl -o- https://neilalexander.s3.eu-west-2.amazonaws.com/deb/key.txt | sudo apt-key add -
+```
+
+Then add the repository:
+```
+configure
+set system package repository yggdrasil distribution edgerouter
+set system package repository yggdrasil components yggdrasil
+set system package repository yggdrasil url http://neilalexander.s3.eu-west-2.amazonaws.com/deb/
+commit
+save
+```
+
+Then install the `vyatta-yggdrasil` package:
+```
+sudo apt-get update
+sudo apt-get install vyatta-yggdrasil
+```
+
+Yggdrasil can then be updated in the future by updating the packages:
+```
+sudo apt-get update
+sudo apt-get upgrade
+```
+
+### One-off package install from CircleCI
+
+If you do not want to configure the repository above, you can perform a one-off
+installation by [downloading the latest vyatta-yggdrasil `.deb`
+package](https://circleci.com/api/v1.1/project/github/yggdrasil-network/yggdrasil-go/latest/artifacts) and then install it:
+```
+curl -O https://xx-xxxxxxxxx-gh.circle-artifacts.com/x/vyatta-yggdrasil-x.x.xxx-mipsel.deb
+sudo dpkg -i vyatta-yggdrasil-x.x.xxx-mipsel.deb
+```
+
+### After installation
+
+Read the [EdgeRouter platform page](platform-edgerouter.md) page for information
+on how to configure Yggdrasil and guidance on modifying the configuration.