Delta Chat Flatpak fails to connect second device after scanning QR code - D-Bus and xdg-settings errors

[ivkrotova]

- Operating System (Linux/Mac/Windows/iOS/Android):
Linux (Ubuntu 20.04, 64-bit)

- Delta Chat Version:
Flatpak version from Flathub (chat.delta.desktop)

- Expected behavior:
When attempting to connect a second device (Android app) via QR code, Delta Chat should successfully establish the connection between the devices.

- Actual behavior:
After scanning the QR code with the second device, the process of adding the second device hangs indefinitely, and no connection is established. Logs show multiple errors related to D-Bus, xdg-settings, and GTK widget failures.

Steps to reproduce the problem:

1. Install Delta Chat via Flatpak on Ubuntu 20.04.
2. Open the app and attempt to connect a second device using the QR code feature.
3. Scan the QR code from the second device.
4. Observe that the connection process hangs without successfully adding the device.

Screenshots:

• Logs:

2024-10-05T16:59:21.678Z	main/index            	INFO	""	"Deltachat Version 1.46.8 flathub 1727722460000"
2024-10-05T16:59:21.876Z	main/index            	INFO	""	"cwd /home/user/.var/app/chat.delta.desktop/config/DeltaChat/accounts"
2024-10-05T16:59:21.879Z	main/deltachat        	INFO	""	"using deltachat-rpc-server at"	{"serverPath":"/app/delta/resources/app/node_modules/@deltachat/stdio-rpc-server-linux-x64/deltachat-rpc-server"}
2024-10-05T16:59:21.884Z	main/deltachat        	INFO	""	"HI"
2024-10-05T16:59:21.885Z	main/deltachat        	INFO	""	"Ready, starting accounts io..."
2024-10-05T16:59:21.885Z	main/deltachat        	INFO	""	"Started accounts io."
2024-10-05T16:59:22.017Z	main/menu             	INFO	""	"rebuilding menu with locale en"
2024-10-05T16:59:22.173Z	core/event            	WARNING	""	1	"src/context.rs:465: can not start io on a context that is not configured"
2024-10-05T16:59:22.227Z	/mainWindow           	INFO	""	"preq"	"background-sync"
2024-10-05T16:59:22.228Z	/mainWindow           	INFO	""	"main window requested \"background-sync\" permission, but we denied it, because it is not in the list of allowed permissions."
2024-10-05T16:59:22.249Z	main/tray             	INFO	""	"add icon tray"
2024-10-05T16:59:22.268Z	renderer/stockstrings 	INFO	""	"loading core translations"
2024-10-05T16:59:22.277Z	main/menu             	INFO	""	"rebuilding menu with locale en"
2024-10-05T16:59:22.300Z	core/event            	WARNING	""	1	"src/context.rs:465: can not start io on a context that is not configured"
2024-10-05T16:59:22.363Z	main/state            	INFO	""	"Saving state to /home/user/.var/app/chat.delta.desktop/config/DeltaChat/config.json"
2024-10-05T16:59:22.365Z	renderer/ScreenController	INFO	""	"system_info"	{"arch":"64","deltachat_core_version":"v1.142.12","level":"awesome","num_cpus":"8","sqlite_version":"3.45.3"}
2024-10-05T16:59:22.366Z	renderer/ScreenController	INFO	""	"account_info"	{"arch":"64","authserv_id_candidates":"","bcc_self":"1","blobdir":"/home/user/.var/app/chat.delta.desktop/config/DeltaChat/accounts/cccdf93f-a84b-4f96-99c1-08c0765eea65/dc.db-blobs","bot":"0","configured_inbox_folder":"INBOX","configured_mvbox_folder":"<unset>","configured_sentbox_folder":"<unset>","configured_trash_folder":"<unset>","database_dir":"/home/user/.var/app/chat.delta.desktop/config/DeltaChat/accounts/cccdf93f-a84b-4f96-99c1-08c0765eea65/dc.db","database_encrypted":"false","database_version":"117","debug_logging":"0","delete_device_after":"0","delete_server_after":"0","delete_to_trash":"<unset>","deltachat_core_version":"v1.142.12","disable_idle":"false","displayname":"0","download_limit":"0","e2ee_enabled":"1","entered_account_settings":"unset imap:unset:0:unset:0:Automatic:AUTH_NORMAL smtp:unset:0:unset:0:Automatic:AUTH_NORMAL cert_automatic","fetch_existing_msgs":"0","fetched_existing_msgs":"true","fingerprint":"<key failure: No self addr configured>","fix_is_chatmail":"false","folders_configured":"0","gossip_period":"172800","is_chatmail":"false","is_configured":"0","is_muted":"false","journal_mode":"wal","key_gen_type":"0","last_cant_decrypt_outgoing_msgs":"0","last_housekeeping":"0","last_msg_id":"0","level":"awesome","mdns_enabled":"1","media_quality":"0","messages_in_contact_requests":"0","mvbox_move":"1","num_cpus":"8","number_of_chat_messages":"0","number_of_chats":"0","number_of_contacts":"0","only_fetch_mvbox":"0","private_key_count":"0","public_key_count":"0","quota_exceeding":"0","save_mime_headers":"false","scan_all_folders_debounce_secs":"60","secondary_addrs":"","selfavatar":"<unset>","sentbox_watch":"0","show_emails":"2","sign_unencrypted":"0","socks5_enabled":"0","sqlite_version":"3.45.3","sync_msgs":"1","uptime":"0h 0m 0s","used_account_settings":"unset imap:unset:0:unset:0:Automatic:AUTH_NORMAL smtp:unset:0:unset:0:Automatic:AUTH_NORMAL cert_automatic","verified_one_on_one_chats":"true","webrtc_instance":"<unset>","webxdc_realtime_enabled":"false"}
2024-10-05T16:59:22.367Z	core/event            	INFO	""	1	"src/chat.rs:4361: Device-message changelog-version-1.46.0-version1 already added."
2024-10-05T16:59:27.568Z	main/menu             	INFO	""	"rebuilding menu with locale en"
2024-10-05T16:59:29.328Z	main/menu             	INFO	""	"rebuilding menu with locale en"
2024-10-05T16:59:30.721Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:30.722Z	/mainWindow           	INFO	""	"preq"	"speaker-selection"
2024-10-05T16:59:30.722Z	/mainWindow           	INFO	""	"main window requested \"speaker-selection\" permission, but we denied it, because it is not in the list of allowed permissions."
2024-10-05T16:59:30.722Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:30.887Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:30.887Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:30.922Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:30.923Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:30.924Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:30.924Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:31.225Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:31.227Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:31.262Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:31.263Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:31.299Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T16:59:31.563Z	/mainWindow           	INFO	""	"preq"	"media"
2024-10-05T17:02:00.534Z	main/index            	INFO	""	"Starting app shutdown process"

[link2xt]

Likely a duplicate of #4171, flatpak as well

[ivkrotova]

Everything started working after turning off the VPN on both devices (desktop and mobile)