mysql server starts but mysqladmin gives not found error

[Zulfi Khan]

Hi,
I deleted mysql from ubuntu 18.04. Now I am trying to install again. I tried the command:
$ sudo apt install mysql-client-core-5.7

The above command worked and ended with:

Preparing to unpack .../mysql-client-core-5.7_5.7.35-0ubuntu0.18.04.1_amd64.deb ...
Unpacking mysql-client-core-5.7 (5.7.35-0ubuntu0.18.04.1) over (5.7.34-0ubuntu0.18.04.1) ...
Setting up mysql-client-core-5.7 (5.7.35-0ubuntu0.18.04.1) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) …

But when I tried to install

@lc2530hz:~$ sudo apt install mariadb-client-core-10.1

I got following messages:

The following packages have unmet dependencies:
mariadb-client-core-10.1 : Conflicts: mysql-client-5.7 but 5.7.35-0ubuntu0.18.04.1 is to be installed
mysql-client-5.7 : Depends: mysql-client-core-5.7 but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.


However, mysql start command executed:

@lc2530hz:~$ mysql server start
mysql Ver 14.14 Distrib 5.7.35, for Linux (x86_64) using EditLine wrapper
Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

But I can’t create the password:

@lc2530hz:~$ mysqladmin -u root password NEWPASSWORD

Command 'mysqladmin' not found, but can be installed with:

sudo apt install mysql-client-5.7
sudo apt install mariadb-client-10.1


Please guide me how I can create my account password first time because mysqladmin is not working.

Zulfi.