Dropbox isn't syncing anymore after upgrading to Ubuntu 20.04

Hey MonikaE, thanks for reaching out!

Can you actually check the sync status of the Dropbox app, by hovering your cursor over the Dropbox icon in your system tray?

And can you also confirm that you have the correct system requirements to run Dropbox on your computer after your OS update?

Let me know what you find!

Hovering over the system tray icon doesn't really do anything, but "dropbox status" in the console yields "Synchronizing".

The requirements are fulfilled, it's Ubuntu 20.04 and ext4. (As I don't have GNOME or Xfce there are no icons in the file manager to show the synchronization status, but I don't mind that.)

Try dropbox (1) - Linux Man Pages. There are some commands that might be helpful. You can try running some of them from terminal. A friend of mine had same issue, no syncing in Ubuntu 20.04. He used some of the commands provided to start the sync process.

dropbox status
dropbox help [COMMAND]
dropbox puburl FILE
dropbox stop
dropbox running
dropbox start [-i]
dropbox filestatus [-l] [-a] [FILE]...
dropbox ls [FILE]...
dropbox autostart [y/n]
dropbox exclude [list]
dropbox lansync [y/n]

I'm familiar with them (as you see I have just used "dropbox status", but they did not help with the problem.

I have now deleted/moved all local files from the Dropbox folder (I stopped Dropbox before) and restarted Dropbox and now things maybe started working. Now dropbox status does not show "Synchronisieren ..." (Synchronizing ...) but instead shows "Synchronisierung läuft (191.369 Dateien • 20 Std.)
191.369 Dateien werden heruntergeladen (0,0 KB/Sek., 20 Std.)" meaning "Synchronization is running/in progress" and the time and number of files.

But I'm worried about the "0,0 KB/Second" speed. We will see. The folder structure has already been downloaded and a few small files.

At first the solution with deleting/moving all local files seemed to have worked fine, everything was downloaded after a day, the Dropbox icon stopped blinking, the "dropbox status" said "Aktualisiert", which may mean "current".

Now after a reboot of the computer (not sure if that is responsible) the Dropbox icon is blinking again, "dropbox status" yields "Synchronisieren ..." like it did when it was not actually synchronizing anything, the "recently changed files" submenu shows nothing. The folder with the automatic camera uploads from the phone shows photos from yesterday but not from today.

I'm afraid I'm back at square 1. I can't keep deleting and redownloading all my files and remembering which ones I have edited on my PC in the meantime to copy them back.

Thanks for the update on this, MonikaE!

Can you please try a more advanced reinstall of the Dropbox application, to see if that helps?

Also make sure to try and temporarily disable any third party apps like an antivirus or firewall that you may have.

Please check my initial post, I did the advanced reinstall before posting the question.

As usual on Linux, I am not running any antivirus or firewall.

But thanks for the suggestions anyway.

In /var/log/syslog.1 I found three entries like these:

"Jun 25 22:06:47 lilly ”‚»[34300]: Unable to monitor entire Dropbox folder hierarchy. Please run "echo fs.inotify.max_user_watches=100000 | sudo tee -a /etc/sysctl.conf; sudo sysctl -p" and restart Dropbox to fix the problem."

(with differing special characters before 34300).

I've tried the command and restarted Dropbox. For a few second I thought the situation had improved, because now the submenu "recently changed files" showed some files. But now everything is as before.

By the way the submenu "snooze notifications" doesn't load most of the time (it should show 30 minutes, 1 hour and until tomorrow). That was already so before I used the command.

dropbox filestatus * shows "unwatched" for all files (both before and after trying the above command). I have not unselected any subfolders from synchronization in the settings.

~/.dropbox-dist$ strace ./dropboxd

yields a lot of output like this mentioning "The resource is currently not available":

futex(0x7f5c79e00e94, FUTEX_WAIT_BITSET_PRIVATE, 0, {tv_sec=5279, tv_nsec=506637588}, FUTEX_BITSET_MATCH_ANY)
= -1 EAGAIN (Die Ressource ist zur Zeit nicht verfügbar)
futex(0x7f5c79e00ee8, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f5c79e00e98, FUTEX_WAKE_PRIVATE, 1) = 0
recvmsg(24, {msg_namelen=0}, 0)         = -1 EAGAIN (Die Ressource ist zur Zeit nicht verfügbar)
poll([{fd=14, events=POLLIN}, {fd=15, events=POLLIN}, {fd=16, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}], 5, 499) = 1 ([{fd=14, revents=POLLIN}])
read(14, "\1\0\0\0\0\0\0\0", 16)        = 8
write(29, "\1\0\0\0\0\0\0\0", 😎        = 8
futex(0x7f5bb000dd70, FUTEX_WAKE_PRIVATE, 1) = 1
recvmsg(24, {msg_namelen=0}, 0)         = -1 EAGAIN (Die Ressource ist zur Zeit nicht verfügbar)
poll([{fd=14, events=POLLIN}, {fd=15, events=POLLIN}, {fd=16, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}], 5, 487) = 0 (Timeout)
futex(0x7f5c79e00e90, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f5c79e00e98, FUTEX_WAKE_PRIVATE, 1) = 1
write(29, "\1\0\0\0\0\0\0\0", 😎        = 8

I'm not sure if this is meaningful or indicates a problem.