This is the output of command

apt upgrade

Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
galera-4 libmariadb3 libmariadbclient18 mariadb-client mariadb-client-10.4 mariadb-client-core-10.4 mariadb-common mariadb-server mariadb-server-10.4 mariadb-server-core-10.4
mysql-common
11 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 22.2 MB of archives.
After this operation, 207 kB disk space will be freed.
Do you want to continue? [Y/n] Y
Err:1 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main ppc64el mysql-common all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:1 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main i386 mysql-common all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:1 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mysql-common all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:2 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main ppc64el mariadb-common all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:2 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main i386 mariadb-common all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:2 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mariadb-common all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:3 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main ppc64el mariadb-server all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:3 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main i386 mariadb-server all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:3 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mariadb-server all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:4 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 galera-4 amd64 26.4.3-stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:5 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main ppc64el mariadb-client all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:5 http://mirror.zol.co.zw/mariadb/repo/10.4/debian stretch/main i386 mariadb-client all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:5 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mariadb-client all 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:6 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 libmariadbclient18 amd64 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:7 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 libmariadb3 amd64 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:8 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mariadb-client-core-10.4 amd64 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:9 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mariadb-client-10.4 amd64 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:10 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mariadb-server-core-10.4 amd64 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
Err:11 http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian stretch/main amd64 mariadb-server-10.4 amd64 1:10.4.9+maria~stretch
404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mirror.zol.co.zw/mariadb/repo/10.4/debian/pool/main/m/mariadb-10.4/mysql-common_10.4.9+maria~stretch_all.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mirror.zol.co.zw/mariadb/repo/10.4/debian/pool/main/m/mariadb-10.4/mariadb-common_10.4.9+maria~stretch_all.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mirror.zol.co.zw/mariadb/repo/10.4/debian/pool/main/m/mariadb-10.4/mariadb-server_10.4.9+maria~stretch_all.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian/pool/main/g/galera-4/galera-4_26.4.3-stretch_amd64.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mirror.zol.co.zw/mariadb/repo/10.4/debian/pool/main/m/mariadb-10.4/mariadb-client_10.4.9+maria~stretch_all.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian/pool/main/m/mariadb-10.4/libmariadbclient18_10.4.9+maria~stretch_amd64.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian/pool/main/m/mariadb-10.4/libmariadb3_10.4.9+maria~stretch_amd64.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian/pool/main/m/mariadb-10.4/mariadb-client-core-10.4_10.4.9+maria~stretch_amd64.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian/pool/main/m/mariadb-10.4/mariadb-client-10.4_10.4.9+maria~stretch_amd64.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian/pool/main/m/mariadb-10.4/mariadb-server-core-10.4_10.4.9+maria~stretch_amd64.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]
E: Failed to fetch http://mariadb.mirror.liquidtelecom.com/repo/10.4/debian/pool/main/m/mariadb-10.4/mariadb-server-10.4_10.4.9+maria~stretch_amd64.deb 404 Not Found [IP: 2c0f:fe40:8001:10::1 80]