Issue installing sudo using apt-get

I am attempting to install sudo on my ReadyNAS to be able to run some stuff from the command line.  When I attempt to do so using apt-get, I get an error - full output is below (Spaces are added for ease of reading):

Welcome to ReadyNASOS 6.9.4
Last login: Tue Sep 18 16:28:19 2018 from ool-2f160162.static.optonline.net

root@GeoffNAS:~# apt-get install sudo

Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 mariadb-server : Depends: mariadb-server-10.0 (>= 10.0.36-0+deb8u1) but 10.0.35-0+deb8u1 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

root@GeoffNAS:~# apt-get -f install

Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following package was automatically installed and is no longer required:
  libssh2-1
Use 'apt autoremove' to remove it.
The following additional packages will be installed:
  mariadb-server-10.0
Suggested packages:
  mailx mariadb-test tinyca
Recommended packages:
  libhtml-template-perl
The following packages will be upgraded:
  mariadb-server-10.0
1 upgraded, 0 newly installed, 0 to remove and 12 not upgraded.
4 not fully installed or removed.
Need to get 0 B/3,435 kB of archives.
After this operation, 11.3 kB disk space will be freed.
Do you want to continue? [Y/n] Y

debconf: delaying package configuration, since apt-utils is not installed
(Reading database ... 37099 files and directories currently installed.)
Preparing to unpack .../mariadb-server-10.0_10.0.36-0+deb8u1_armel.deb ...
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline
2540
There is a MySQL server running, but we failed in our attempts to stop it.
Stop it yourself and try again!
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline
2540
There is a MySQL server running, but we failed in our attempts to stop it.
Stop it yourself and try again!
dpkg: error processing archive /var/cache/apt/archives/mariadb-server-10.0_10.0.36-0+deb8u1_armel.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline
insserv: warning: current start runlevel(s) (empty) of script `mysql' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `mysql' overrides LSB defaults (0 1 6).
Errors were encountered while processing:
 /var/cache/apt/archives/mariadb-server-10.0_10.0.36-0+deb8u1_armel.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

root@GeoffNAS:~#