dpkg: error processing package redis-server (–configure):
installed redis-server package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of redis:
redis depends on redis-server (<< 5:4.0.9-1ubuntu0.2.1~); however: Package redis-server is not configured yet. redis depends on redis-server (>= 5:4.0.9-1ubuntu0.2); however:
Package redis-server is not configured yet.

dpkg: error processing package redis (–configure):
dependency problems – leaving unconfigured
Processing triggers for libc-bin (2.27-3ubuntu1.2) …
No apport report written because the error message indicates its a followup error from a previous failure.
Processing triggers for systemd (237-3ubuntu10.42) …

vi /etc/redis/redis.conf
bind 127.0.0.1
supervised systemd

Again:
apt install redis-server