Edit: Problem 1 has been resolved.
I followed this link and changed my user id to 1000 (same as Linux user id), so that I can share files freely between Mac and Linux. Now I have these two problems:
- I am not able to empty trash. I have checked file permissions in the trash and they belong to my current user. Even the files themselves were located in a local disk, not an external disk before deletion.
- Login window doesn't list users, it just shows 2 fields one for username and another for password. I checked Login Options under "Users and Groups" in the System Preferences, and it is set to "Display login window as List of users".
How can I fix this?