Installer won't go past "DOWNLOADING releases.json"

[nevinpuri]

Describe the bug
Whenever you launch ImpactInstaller 0.9.4, the final log which is shown is
DOWNLOADING http://impactclient.net/releases.json, and it doesn't go any further than that.
Note: I can navigate to the link on Firefox and it will work fine there.

I'm on Ubuntu 20.04 LTS, so maybe it's a network library that I'm missing?

To Reproduce
Steps to reproduce the behavior:
Open Terminal
java -jar ImpactInstaller-0.9.4.jar
Program gets stuck on "Downloading"

Expected behavior
The download is supposed to finish, and you are supposed to be able to see the gui

Screenshots

➜  Downloads java -jar ImpactInstaller-0.9.4.jar 
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Sending event category=installer action=display label=null cid=REDACTED
Fetching releases from ImpactDevelopment/ImpactReleases
DOWNLOADING http://impactclient.net/releases.json

Desktop (please complete the following information):

• OS: Linux
• Firefox
• Ubuntu 20.04

Additional context
Add any other context about the problem here.

[nevinpuri]

Just tried on a different desktop environment, and the gui showed up. My guess is that DWM doesn't have some libraries that xfce has.

[nickcat1]

Try sudo chmod +x path/file.jar.
Replace path with path to the file.