Permissions are:
ls -lh /var/lib/update-notifier/package-data-downloads/ insgesamt 0 drwxr-xr-x 1 root root 0 Jan 7 04:21 partial -rw-r--r-- 1 root root 0 Jan 7 04:21 ttf-mscorefonts-installer.failed
Indeed, a user with name "_apt" can't write to directory "partial".
Permissions need to be changed here. Or privileges should not be dropped (the latter might be insecure).
Permissions are:
ls -lh /var/lib/ update- notifier/ package- data-downloads/ -installer. failed
insgesamt 0
drwxr-xr-x 1 root root 0 Jan 7 04:21 partial
-rw-r--r-- 1 root root 0 Jan 7 04:21 ttf-mscorefonts
Indeed, a user with name "_apt" can't write to directory "partial".
Permissions need to be changed here. Or privileges should not be dropped (the latter might be insecure).