Fresh install; login and permission issues

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Hello! I have installed Nextcloud on my Raspberry Pi 3 but I can’t log in because it says user already in use. Raspbian is updated. Nextcloud is the latest version.

Here is what I see after running tail
‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.
Mar 18 20:08:24 raspberrypi nextcloud.nextcloud-fixer[867]: ERROR: ld.so: object ‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.
Mar 18 20:08:25 raspberrypi nextcloud.mysql[872]: ERROR: ld.so: object ‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.
Mar 18 20:08:25 raspberrypi nextcloud.nextcloud-fixer[867]: ERROR: ld.so: object ‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.
Mar 18 20:08:25 raspberrypi nextcloud.nextcloud-fixer[867]: ERROR: ld.so: object ‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.
Mar 18 20:08:25 raspberrypi nextcloud.nextcloud-fixer[867]: ERROR: ld.so: object ‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.
Mar 18 20:08:25 raspberrypi nextcloud.nextcloud-fixer[867]: ERROR: ld.so: object ‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.
Mar 18 20:08:26 raspberrypi nextcloud.mysql[872]: ERROR: ld.so: object ‘/usr/lib/arm-linux-gnueabihf/libarmmem.so’ from /etc/ld.so.preload cannot be preloaded (cannot open shared object file): ignored.