ubuntu error : Errors were encountered while processing: redis-server

I am getting error when I run sudo apt-get upgrade

output error :

Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] Y Setting up redis-server (5:4.0.9-1) ... dpkg-statoverride: error: user 'redis' does not exist dpkg: error processing package redis-server (--configure): installed redis-server package post-installation script subprocess returned error exit status 2 Errors were encountered while processing: redis-server E: Sub-process /usr/bin/dpkg returned an error code (1) 

the error about redis-server and can not remove redis-server.

my linux is ubuntu 18 Desktop.

1 Answer

You should probably alter the redis.conf file to force it to use IPv4 if it supports that mode only and then maybe you could run it without IPv6.

nano /etc/redis/redis.conf 

Simply remove the ::1 IPv6 loopback address from the bind config option:

- bind 127.0.0.1 ::1 + bind 127.0.0.1 

Now redis will not try to use the IPv6 network.

Try to install again

apt install redis-server 

Test the Redis Instance Functionality To test that your service is functioning correctly, connect to the Redis server with the command-line client:

redis-cli 

In the prompt that follows, test connectivity by typing:

ping You should see:

$ 127.0.0.1:6379> ping 

Output

PONG 

Check that you can set keys by typing:

$ 127.0.0.1:6379> set test "It's working!" 

Output

OK 

Now, retrieve the value by typing:

$ 127.0.0.1:6379> get test 

You should be able to retrieve the value we stored:

Output

$ 127.0.0.1:6379> "It's working!"

Exit the Redis prompt to get back to the shell:

127.0.0.1:6379> exit 

As a final test, let's restart the Redis instance:

$ sudo systemctl restart redis