Free and open-source Matroska software MKVToolNix v21.0.0 was released days ago. The biggest change is that mkvinfo’s GUI portion has been removed.

New features and enhancements in MKVToolNix 21.0.0:

• mkvmerge: track statistics tags: the TagDefault element will not be written anymore as it was always set to the default value 1 anyway.
• mkvmerge, MKVToolNix GUI: JSON files can now contain C++-style line comments outside of strings (e.g. something like this: // this is ignored). Such comments, even though not part of the official JSON specifications, are now ignored when reading JSON files.
• MKVToolNix GUI: chapter editor: opening a Matroska file without chapters in it will now open the file in an empty chapter editor instead of showing an error message.
• MKVToolNix GUI: an “info” tool has been added, replacing the functionality of mkvinfo’s GUI. The functionality is not on par yet but will be for release v22.

For the bug-fixes and other changes, see the release note.

How to Install MKVToolNix 21.0.0 in Ubuntu:

The official apt repository offers the latest packages for Ubuntu 16.04, Ubuntu 17.10 so far.

Open terminal via Ctrl+Alt+T or by searching it from app launcher. When it opens, do following steps:

1. Run command to add the repository:

sudo sh -c 'echo "deb https://mkvtoolnix.download/ubuntu/ $(lsb_release -sc) main" >> /etc/apt/sources.list.d/bunkus.org.list'

Replace $(lsb_release -sc) with xenial for Linux Mint 18.x. And input your password (no visual feedback while typing) when it prompts and hit Enter.

2. Then install the key:

wget -q -O - https://mkvtoolnix.download/gpg-pub-moritzbunkus.txt | sudo apt-key add -

3. Finally either upgrade the software via Software Updater (Update Manager):

or run command to install the software packages:

sudo apt-get update

sudo apt-get install mkvtoolnix mkvtoolnix-gui

Uninstall:

To remove the repository, launch Software & Updates utility and navigate to Other Software tab.

To remove MKVToolNix, use Synaptic Package Manager or run following command:

sudo apt-get remove --autoremove mkvtoolnix mkvtoolnix-gui