Panic running examples on Ubuntu 18.04

[Charles-Schleich]

Error message.

charles@charles-TE:~/rust/iced/examples/progress_bar (master)
$ cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.29s
     Running `/home/charles/rust/iced/target/debug/progress_bar`
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /rustc/f3e1a954d2ead4e2fc197c7da7d71e6c61bad196/src/libcore/macros/mod.rs:15:40
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

charles@charles-TE:~/rust/iced/examples/progress_bar (master)
$ cargo --version
cargo 1.41.0 (626f0f40e 2019-12-03)

Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.3 LTS
Release:	18.04
Codename:	bionic

Am i attempting to run this incorrectly ?
I have done a clean build. are there any libraries I need to support this ?
or some command line arguments to target a specific renderer ?

Works fine on my windows target, just my ubuntu target that is failing.

[Charles-Schleich]

Do i need Vulkan installed on Ubuntu to run this ?
Even if i don't have a discrete GPU ?

[hecrj]

Yes, you need a graphics driver that supports Vulkan.

There is no built-in OpenGL / software renderer yet.