Sync failed: please check your network connection.

[TimeBandit]

• I'm seeing this issue on Ubuntu 18.04.1 LTS on my desktop.
• Still work on 16.0.4 LTS on my laptop.
• The upgrade to the latest LTS version of Ubuntu on my desktop somehow broke Lepton.
• The developer tools show no errors.
• I notice that Lepton has installed itself at /snap/lepton/1
• The only cache folder I could find was at /home/[username]/.cache but this did not contain a Lepton folder.

[hackjutsu]

@TimeBandit Thanks for reporting the issue. Which version of Lepton are you using? I'll see whether I can reproduce the issue on my side.

[TimeBandit]

@hackjutsu
lepton --version => 01

[hackjutsu]

I actually have no idea where lepton --version command comes from. Maybe it's a snap command. Usually command + , is the way to get Lepton version when the app is launched or inspect the logs. The scenario is tricky here because you cannot launch Lepton and there is no logs... But it's very likely to be v1.7.0. If snap doesn't work for you at this moment, maybe have a try a for the AppImage format?
https://github.com/hackjutsu/Lepton/releases/tag/v1.7.0 (I'll try debug the snap package when I get some free time 🌮 )