Trying to install orbit on ubuntu18. Failing...

Hi,

Thanks for the great work.

I am trying to install orbit on my ubuntu 18 kernel 5.11 system. I am currently not able to successfully run the bootstrap script. The error message is,

```
$ ./bootstrap-orbit.sh
...
...
...
E: Unable to locate package libopengl-dev
```

Any help here will be appreciated. Thank you.