electron: 5.0.0-beta.1
platform: linux x64

**Actual behavior**

https://github.com/electron/electron-quick-start app fails to start with the following error:
```
[3937:0131/003107.790938:FATAL:zygote_host_impl_linux.cc(116)] No usable sandbox! Update your kernel or see https://chromium.googlesource.com/chromium/src/+/master/docs/linux_suid_sandbox_development.md for more information on developing with the SUID sandbox. If you want to live dangerously and need an immediate workaround, you can try using --no-sandbox.
```

**To Reproduce**

- `git clone https://github.com/electron/electron-quick-start.git`
- `cd electron-quick-start`
- `npm install`
- `npm add --only=dev electron@5.0.0-beta.1`
- any of the following commands fail:
  - `npm start`
  - `node_modules/.bin/electron --version`

**Additional Information**

Worth to mention that event just `node_modules/.bin/electron --version` execution fails with the same error.

CC @nornagon
atom/app/atom_main_delegate.cc
std::string custom_locale;
  ui::ResourceBundle::InitSharedInstanceWithLocale(
      custom_locale, nullptr, ui::ResourceBundle::LOAD_COMMON_RESOURCES);
  auto* cmd_line = base::CommandLine::ForCurrentProcess();
  if (cmd_line->HasSwitch(::switches::kLang)) {
    const std::string locale = cmd_line->GetSwitchValueASCII(::switches::kLang);
    const base::FilePath locale_file_path =
        ui::ResourceBundle::GetSharedInstance().GetLocaleFilePath(locale, true);
    if (!locale_file_path.empty()) {
      custom_locale = locale;
#if defined(OS_LINUX)
      /* When built with USE_GLIB, libcc's GetApplicationLocaleInternal() uses
       * glib's g_get_language_names(), which keys off of getenv("LC_ALL") */
      g_setenv("LC_ALL", custom_locale.c_str(), TRUE);
#endif
    }
  }
#if defined(OS_MACOSX)
  if (custom_locale.empty())
    l10n_util::OverrideLocaleWithCocoaLocale();
#endif
  LoadResourceBundle(custom_locale);
  AtomBrowserClient::SetApplicationLocale(
      l10n_util::GetApplicationLocale(custom_locale));
}
void AtomMainDelegate::PreSandboxStartup() {