8 – Drush Error While Trying to Update Drupal: Can not Copy / Move

I have a Drupal site running on localhost (windows) that I try to update from 8.6.7 to 8.6.15.

When using Drush to update (drupal drupal -y), I encounter the following error:

Can not Copy C:  Users  USERNA ~ 2  AppData  Local  Temp / drush_tmp_1556533742_5cc6d1ee1cacf / drupal-8.6.15 to
W:  htdocs  site-name  www / drupal-8.6.15.
Can not move C:  Users  USERNA ~ 2  AppData  Local  Temp / drush_tmp_1556533742_5cc6d1ee1cacf / drupal-8.6.15 to
W:  htdocs  site-name  www / drupal-8.6.15.
The update of the drupal project failed. Attempt to return to the previously installed version.
The backups have been successfully restored.

I have tried:

  • clear the Drush cache (drush cc drush)
  • updated Drush (via the composer) (now running Drush 8.2.3)
  • clean up Drupal caches

But the problem remains.

This problem does NOT occur when updating modules. Only Drupal himself.

I've checked the C: Users USERNA ~ 2 AppData Local Temp while Drush was working, and I was able to confirm that the drush_tmp_1556533742_5cc6d1ee1cacf The subfolder was actually present for a while (containing the .tar.gz file and its saved Drupal folder). So, there is no problem writing in this folder.

Do you have an idea of ​​what causes this and how to solve it?

Thank you in advance.