Sometimes it solves issues with different cursor themes, or issues with cursor itself, where it is set to 'default' in DM, but /usr/share/icons/default directory is missing.

1. create directory /usr/share/icons/default (if missing)
2. go to the directory and create file index.theme (if missing)
3. insert following content to it (or replace existing content)

[icon theme]
Inherits=Adwaita

1. Replace Adwaita with the name of your favorite (and installed) cursor theme.
2. Restart X

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