adrian@li137-80:~$ sudo apt-get install libavutil55
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libavutil55 is already the newest version (7:3.2-0~16.04.york0).
libavutil55 set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
adrian@li137-80:~$ sudo apt install --reinstall libavutil55
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/183 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 70511 files and directories currently installed.)
Preparing to unpack .../libavutil55_7%3a3.2-0~16.04.york0_amd64.deb ...
Unpacking libavutil55:amd64 (7:3.2-0~16.04.york0) over (7:3.2-0~16.04.york0) ...
Processing triggers for libc-bin (2.23-0ubuntu4) ...
Setting up libavutil55:amd64 (7:3.2-0~16.04.york0) ...
Processing triggers for libc-bin (2.23-0ubuntu4) ...
adrian@li137-80:~$ sudo apt install --reinstall libswresample2
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:
 libswresample2 : Depends: libavutil55 (>= 7:3.2) but 7:3.2-0~16.04.york0 is to be installed
E: Unable to correct problems, you have held broken packages.
adrian@li137-80:~$ sudo apt install --reinstall libavutil55
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/183 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 70511 files and directories currently installed.)
Preparing to unpack .../libavutil55_7%3a3.2-0~16.04.york0_amd64.deb ...
Unpacking libavutil55:amd64 (7:3.2-0~16.04.york0) over (7:3.2-0~16.04.york0) ...
Processing triggers for libc-bin (2.23-0ubuntu4) ...
Setting up libavutil55:amd64 (7:3.2-0~16.04.york0) ...
Processing triggers for libc-bin (2.23-0ubuntu4) ...
adrian@li137-80:~$ sudo apt install --reinstall libswresample2
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:
 libswresample2 : Depends: libavutil55 (>= 7:3.2) but 7:3.2-0~16.04.york0 is to be installed
E: Unable to correct problems, you have held broken packages.