Blank window with Unity Hub

So I've just installed the latest version of Unity Hub (3.4.1) using the apt repository from Unity. The install went through with no problem, but it doesn't work properly: the main window is blank.
It appears the Hub is working properly in the background, as the widget in the tray behaves normally, but whatever I try, I just can't find any way to solve the blank window problem.

When I start up Unity Hub in a terminal, I get the following error message, but I don't quite know what to make of it:



[I][71210:0225/105720.409826:ERROR:gpu_process_host.cc(974)] GPU process exited unexpectedly: exit_code=5

[71210:0225/105720.629017:ERROR:gpu_process_host.cc(974)] GPU process exited unexpectedly: exit_code=5

[71210:0225/105720.812470:ERROR:gpu_process_host.cc(974)] GPU process exited unexpectedly: exit_code=5

[71210:0225/105720.928222:ERROR:gpu_process_host.cc(974)] GPU process exited unexpectedly: exit_code=5

[71210:0225/105721.029237:ERROR:gpu_process_host.cc(974)] GPU process exited unexpectedly: exit_code=5

[71210:0225/105721.134052:ERROR:gpu_process_host.cc(974)] GPU process exited unexpectedly: exit_code=5

[71315:0225/105721.151950:ERROR:gpu_init.cc(481)] Passthrough is not supported, GL is disabled, ANGLE is

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:

Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Error: The name org.freedesktop.secrets was not provided by any .service files

(Use `unityhub-bin --trace-warnings ...` to show where the warning was created)

(node:71210) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 7)

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:

Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 8)

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:

Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 9)

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:

Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 10)

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:

Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Error: The name org.freedesktop.secrets was not provided by any .service files

(node:71210) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 11)

APPIMAGE env is not defined, current application is not an AppImage

[71210:0225/105722.364710:ERROR:browser_main_loop.cc(271)] Gdk: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed[/I]