Use apt get without WLAN

The basic idea is to use a HTTP proxy forwarded via adb.

Proxy with Apache

Of course you can use any other HTTP proxy, just showing apache as an example. This must all be done on your PC of course.

Create /etc/apache2/conf.d/proxy with the following contents:

ProxyRequests On
ProxyVia On

<Proxy *>
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1
</Proxy> 

Then run the following commands:

a2enmod proxy proxy_http
service apache2 restart

Use apt-get with the Proxy

First you need to get SSH access, please see Use SSH Login without WLAN.

Then it is quite simple, starting on your PC:

adb forward tcp:2022 tcp:22
slogin -p2022 -R8080:localhost:80 phablet@localhost

On your device you need to become root for the environment variable to work.

sudo su -
export http_proxy="http://localhost:8080"
apt-get update

Again, "sudo apt-get update" does not work; you have to become root before using "export".