About the packages that were upgraded. This bug appeared a few days before it was reported here on 2017-07-29. I can remember I tried to investigate for a few days before finding and confirming this bug report.
From my file/var/log/apt/history.log.2.gz on my own computer I see that I installed "vdpauinfo" on 2017-07-27, probably in order to investigate this bug:
About the packages that were upgraded. This bug appeared a few days before it was reported here on 2017-07-29. I can remember I tried to investigate for a few days before finding and confirming this bug report.
From my file/var/ log/apt/ history. log.2.gz on my own computer I see that I installed "vdpauinfo" on 2017-07-27, probably in order to investigate this bug:
Start-Date: 2017-07-27 22:30:56
Commandline: apt install vdpauinfo
Requested-By: dimitri (1000)
Install: vdpauinfo:amd64 (1.0-1)
End-Date: 2017-07-27 22:31:01
So the updates responsible for this bug probably occurred hours to days before that. I think this update is responsible:
Start-Date: 2017-07-27 21:32:51 commit- packages' sender=':1.93' 1ubuntu1~ 16.04.1, automatic), libllvm4.0:i386 (1:4.0- 1ubuntu1~ 16.04.1, automatic), libwayland-bin:a 1~ubuntu16. 04.1, automatic), libinput-bin:amd64 (1.6.3- 1ubuntu1~ 16.04.1, automatic), libsensors4:i386 (1:3.4.0-2, automatic) 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libdrm- nouveau2: amd64 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libdrm- nouveau2: i386 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libwacom- common: amd64 (0.18-1, 0.22-1~ ubuntu16. 04.1), libegl1- mesa-dev: amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libglapi-mesa:amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libglapi-mesa:i386 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , gnome-software: amd64 (3.20.1+ git20170524. 0.ea2fe2b0- 0ubuntu0. 16.04.1, 3.20.5- 0ubuntu0. 16.04.5) , xfonts-utils:amd64 (1:7.7+3, 1:7.7+3ubuntu0. 16.04.2) , libxatracker2:amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libwacom-bin:amd64 (0.18-1, 0.22-1~ ubuntu16. 04.1), libegl1-mesa:amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libgbm1:amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libwayland- client0: amd64 (1.9.0-1, 1.12.0- 1~ubuntu16. 04.1), x11proto- core-dev: amd64 (7.0.28-2ubuntu1, 7.0.31- 1~ubuntu16. 04.1), libdrm- amdgpu1: amd64 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libdrm-amdgpu1:i386 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libwayland- dev:amd64 (1.9.0-1, 1.12.0- 1~ubuntu16. 04.1), ubuntu- software: amd64 (3.20.1+ git20170524. 0.ea2fe2b0- 0ubuntu0. 16.04.1, 3.20.5- 0ubuntu0. 16.04.5) , libwayland- egl1-mesa: amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libxfont1:amd64 (1:1.5.1-1, 1:1.5.1- 1ubuntu0. 16.04.1) , libdrm2:amd64 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libdrm2:i386 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libgl1- mesa-dri: amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libgl1- mesa-dri: i386 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libgl1- mesa-glx: amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libgl1- mesa-glx: i386 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , libdrm-intel1:amd64 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libdrm-intel1:i386 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libwacom2:amd64 (0.18-1, 0.22-1~ ubuntu16. 04.1), libdrm- radeon1: amd64 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libdrm-radeon1:i386 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), mesa-vdpau- drivers: amd64 (12.0.6- 0ubuntu0. 16.04.1, 17.0.7- 0ubuntu0. 16.04.1) , virtualbox- 5.1:amd64 (5.1.24- 117012~ Ubuntu~ xenial, 5.1.26- 117224~ Ubuntu~ xenial) , gnome-software- common: amd64 (3.20.1+ git20170524. 0.ea2fe2b0- 0ubuntu0. 16.04.1, 3.20.5- 0ubuntu0. 16.04.5) , libdrm-dev:amd64 (2.4.70- 1~ubuntu16. 04.1, 2.4.76- 1~ubuntu16. 04.1), libwayland- server0: amd64 (1.9.0-1, 1.12.0- 1~ubuntu16. 04.1), libinput10:amd64 (1.2.3-1ubuntu1, 1.6.3-1ubuntu1~ 16.04.1) , libwayland- cursor0: amd64 (1.9.0-1, 1.12.0- 1~ubuntu16. 04.1)
Commandline: aptdaemon role='role-
Install: libllvm4.0:amd64 (1:4.0-
md64 (1.12.0-
Upgrade: libgles2-mesa:amd64 (12.0.6-
End-Date: 2017-07-27 21:35:59