Comment 5 for bug 1887396

As of July 2nd, again I can't start chromium after having rebooted Ubuntu without having quitted chromium first. This time, the error indicates a lack of removal of temporary symlinks named SingletonLock and related Singleton*. E.g.:

```
Gtk-Message: 00:39:49.309: Failed to load module "canberra-gtk-module"
Gtk-Message: 00:39:49.311: Failed to load module "canberra-gtk-module"
[11356:11356:0723/003949.329173:ERROR:process_singleton_posix.cc(265)] Failed to unlink /home/albert/snap/chromium/1213/.config/google-chrome/SingletonLock: Permission denied (13)
[11356:11356:0723/003949.329289:ERROR:process_singleton_posix.cc(280)] Failed to create /home/albert/snap/chromium/1213/.config/google-chrome/SingletonLock: File exists (17)
[11356:11356:0723/003949.329363:ERROR:process_singleton_posix.cc(265)] Failed to unlink /home/albert/snap/chromium/1213/.config/google-chrome/SingletonLock: Permission denied (13)
[11356:11356:0723/003949.329412:ERROR:chrome_browser_main.cc(1246)] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
[11356:11547:0723/003949.337100:ERROR:browser_gpu_channel_host_factory.cc(153)] Failed to launch GPU process.
[11564:11564:0723/003949.384057:ERROR:broker_posix.cc(43)] Invalid node channel message

```

Upon removing of the 3 symlinks within the profile folder, still an error:

```
Gtk-Message: 01:00:08.609: Failed to load module "canberra-gtk-module"
Gtk-Message: 01:00:08.610: Failed to load module "canberra-gtk-module"
[13997:13997:0723/010008.630073:ERROR:process_singleton_posix.cc(280)] Failed to create /home/albert/snap/chromium/1213/.config/google-chrome/SingletonLock: Permission denied (13)
[13997:13997:0723/010008.630170:ERROR:chrome_browser_main.cc(1246)] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
[13997:14191:0723/010008.637081:ERROR:browser_gpu_channel_host_factory.cc(153)] Failed to launch GPU process.

```

Any ideas? Thank you!