sherab@sherab-Librem-13-v2:~$ /opt/cxoffice/bin/cxfix --auto
Distribution: Debian+libsane1 64 bit (debianlibsane1)
CrossOver needs your permission to install missing packages.
This operation must be run as root:

   sh -c "apt-get update; apt-get install gstreamer1.0-libav:i386"

Trying with sudo...
[sudo] password for sherab:
Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Get:2 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Ign:3 http://mirrors.evowise.com/linuxmint/packages tessa InRelease
Get:4 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Hit:5 http://mirrors.evowise.com/linuxmint/packages tessa Release
Hit:6 http://archive.canonical.com/ubuntu bionic InRelease
Get:7 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Fetched 252 kB in 1s (360 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 gstreamer1.0-libav:i386 : Depends: libavfilter6:i386 (>= 7:3.4.2) but it is not going to be installed or
                                    libavfilter-extra6:i386 (>= 7:3.4.2) but it is not going to be installed
                           Depends: libavformat57:i386 (>= 7:3.4.2) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Trying to fix the issues one by one:
* missinggstreamer1libav
CrossOver needs your permission to install missing packages.
This operation must be run as root:

   sh -c "apt-get install gstreamer1.0-libav:i386"

Trying with sudo...
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 gstreamer1.0-libav:i386 : Depends: libavfilter6:i386 (>= 7:3.4.2) but it is not going to be installed or
                                    libavfilter-extra6:i386 (>= 7:3.4.2) but it is not going to be installed
                           Depends: libavformat57:i386 (>= 7:3.4.2) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

You may be able to fix some issues by running one of the following commands as root:
Debian 8 (32 bits)     	apt-get install gstreamer1.0-libav:i386 gstreamer1.0-plugins-bad:i386 gstreamer1.0-plugins-ugly:i386
Debian 8 (64 bits)     	apt-get install gstreamer1.0-libav:i386
Fedora 18 to 21 (32 bits)	yum install gstreamer1-plugins-bad-free libgphoto2
Fedora 18 to 21 (64 bits)	yum install libgphoto2.i686 libgphoto2.x86_64
openSUSE 12.3 (32 bits)	zypper install libgphoto2-6
openSUSE 12.3 (64 bits)	zypper install libgphoto2-6-32bit
openSUSE 13 (32 bits)  	zypper install gstreamer-plugins-bad gstreamer-plugins-ugly

There is no automated fix for the remaining issues but you may find help on these pages:
https://www.codeweavers.com/support/wiki/Diag/missinglibvulkan
https://www.codeweavers.com/support/wiki/Diag/missinglibopencl