Question: The GWT Desinger is not working on Ubuntu 12.10. It worked on Ubuntu 12.04. I installed the Eclipse Plugin as described on the [GWT Homepate](https://developers.google.com/web-toolkit/download)
If I want to open the Design-View (for an xml-GWT-File), Eclipse crashes (prompt closing of the application).

I found [this two workarounds](http://www.elgali.net/2012/05/14/gwt-designer-eclipse-plugin-in-ubuntu-12-04/) for which are for 12.04 (but on 12.04 i did not need this to get it working - it worked out of the box for me). I tried them on my 12.10 Ubuntu but they are not working. But I have to say that I can't find the "Use WebKit for rendering GWT UI (if available)"-Flag.

What can I do to get the GWT Designer working? I tested it successfully again on a 12.04 Ubuntu VMware image. If I don't get a solution, I have to downgrade my Ubuntu to 12.04 again.

Answer: 
Ahh, the good old NM bug.

stop network-manager

`sudo rm /var/lib/NetworkManager/NetworkManager.state`

start network-manager

Scream bloody murder if this fixes the issue. (This really should have been fixed a long time ago)
For `Ubuntu 20.04 LTS`:

```
sudo service network-manager stop
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo service network-manager start

```

For `Ubuntu 21.04`:

```
sudo systemctl stop NetworkManager.service
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo systemctl start NetworkManager.service

```

If it does still not work. change your `NetworkManager.conf` file, and change the `managed` is `true` if it was false.

```
$ cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true

[device]
wifi.scan-rand-mac-address=no

```

restart your Network manager service

```
$ service network-manager restart

```