Tacotron-2: E: Package 'libav-tools' has no installation candidate

[SRbone]

/////The environment of Ubuntu 16.04LTS : CUDA 10.0, CUDNN7.6.5, Tensorflow-gpu 1.14.0 .
////When I run the docker build -t tacotron-2_image docker/, there is a problem in " Step 4/10 : "
////Before this step, no errors.
#docker build -t tacotron-2_image docker/
Sending build context to Docker daemon 2.048kB
Step 1/10 : FROM continuumio/anaconda3:latest
---> bdb4a7e92a49
Step 2/10 : FROM tensorflow/tensorflow:latest-gpu-py3
---> e2a4af785bdb
Step 3/10 : RUN apt-get update
---> Using cache
---> 2e7e5b53c499
Step 4/10 : RUN apt-get install -y libasound-dev portaudio19-dev libportaudio2 libportaudiocpp0 ffmpeg libav-tools wget git vim
---> Running in 8415cfdc022d
Reading package lists...
Building dependency tree...
Reading state information...
Package libav-tools is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
ffmpeg

E: Package 'libav-tools' has no installation candidate
The command '/bin/bash -c apt-get install -y libasound-dev portaudio19-dev libportaudio2 libportaudiocpp0 ffmpeg libav-tools wget git vim' returned a non-zero code: 100
#

[nikawool]

https://github.com/Rayhane-mamah/Tacotron-2/pull/467/commits/7fa13872398ae5a52c4138752416950258f5ae04

[SRbone]

7fa1387

thank you very much, I'll try by this way. : )