sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
syslinux-themes-linuxmint-mate
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
11 not fully installed or removed.
Need to get 0 B/43.6 kB of archives.
After this operation, 58.4 kB of additional disk space will be used.
Do you want to continue? [Y/n]
(Reading database ... 319710 files and directories currently installed.)
Preparing to unpack .../syslinux-themes-linuxmint-mate_1.1.0_all.deb ...
Unpacking syslinux-themes-linuxmint-mate (1.1.0) over (1.0.3) ...
dpkg: error processing archive /var/cache/apt/archives/syslinux-themes-linuxmint-mate_1.1.0_all.deb (--unpack):
trying to overwrite '/usr/share/syslinux/themes/linuxmint-mate/isolinux-live/splash.png', which is also in package syslinux-themes-linuxmint-mate-petra 1.0.3
Errors were encountered while processing:
/var/cache/apt/archives/syslinux-themes-linuxmint-mate_1.1.0_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

What to do - What to do???

Remove syslinux-themes-linuxmint-mate-petra

I am not sure as to how to remove petra in the terminal...

sudo apt rm petra? --- or sudo apt rm  syslinux-themes-linuxmint-mate-petra?

I don't want to screw it up.

Thanks in advance.

Ray