Install
<?php
$URL="https://raw.githubusercontent.com/panticz/installit/master/install.vega.sh";

echo "wget -q --no-check-certificate $URL -O - | bash -";
echo "<div><pre>";
</pre></div>

$c = curl_init();
curl_setopt($c, CURLOPT_URL, $URL);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);

echo htmlspecialchars(curl_exec($c));

curl_close($c);

echo "";

?>

Workarround

sudo mkdir -p /usr/share/vega/workspace/
sudo chmod 777 /usr/share/vega/workspace/

Download
https://subgraph.com/vega/download/

Configuration
diff /usr/share/vega/Vega.ini.2015-01-12 /usr/share/vega/Vega.ini
2,5c2,5
< -Xms256m
< -XX:PermSize=128m
< -XX:MaxPermSize=256m
< -Xmx2048m
---
> -Xms1024m
> -XX:PermSize=512m
> -XX:MaxPermSize=1024m
> -Xmx4096m