sudo apt --fix-broken install

mona@goku:~/research/code/PyTorch-Encoding$ sudo apt-get install python3.6
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'python3.6-2to3' for regex 'python3.6'
Note, selecting 'libpython3.6-stdlib' for regex 'python3.6'
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 libopencv-highgui2.4v5 : Depends: libpng12-0 (>= 1.2.13-4) but it is not going to be installed
 open3d-viewer : Depends: libc++1 but it is not going to be installed
                 Depends: libglfw3 but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
mona@goku:~/research/code/PyTorch-Encoding$ sudo apt --fix-broken install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  cpp-7 libpython-dev libpython2.7-dev libpython3-dev python2.7-dev python3-decorator python3-ipython-genutils
  python3-jupyter-core python3-traitlets python3.8-dev
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  libc++1 libc++1-10 libc++abi1-10 libglfw3 libpng12-0
Suggested packages:
  libosmesa6
The following NEW packages will be installed:
  libc++1 libc++1-10 libc++abi1-10 libglfw3 libpng12-0
0 upgraded, 5 newly installed, 0 to remove and 92 not upgraded.
32 not fully installed or removed.
Need to get 329 kB/445 kB of archives.
After this operation, 1,744 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 libc++abi1-10 amd64 1:10.0.0-4ubuntu1 [59.4 kB]
Get:2 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 libc++1-10 amd64 1:10.0.0-4ubuntu1 [193 kB]
Get:3 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 libc++1 amd64 1:10.0-50~exp1 [2,904 B]
Get:4 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 libglfw3 amd64 3.3.2-1 [73.6 kB]
Fetched 329 kB in 0s (1,153 kB/s)
(Reading database ... 408600 files and directories currently installed.)
Preparing to unpack .../libpng12-0_1.2.54-1ubuntu1_amd64.deb ...
Unpacking libpng12-0:amd64 (1.2.54-1ubuntu1) ...
dpkg: error processing archive /var/cache/apt/archives/libpng12-0_1.2.54-1ubuntu1_amd64.deb (--unpack):
 unable to install new version of '/lib/x86_64-linux-gnu/libpng12.so.0': No such file or directory
No apport report written because the error message indicates an issue on the local system
                                                                                         Selecting previously unselected
 package libc++abi1-10:amd64.
Preparing to unpack .../libc++abi1-10_1%3a10.0.0-4ubuntu1_amd64.deb ...
Unpacking libc++abi1-10:amd64 (1:10.0.0-4ubuntu1) ...
Selecting previously unselected package libc++1-10:amd64.
Preparing to unpack .../libc++1-10_1%3a10.0.0-4ubuntu1_amd64.deb ...
Unpacking libc++1-10:amd64 (1:10.0.0-4ubuntu1) ...
Selecting previously unselected package libc++1:amd64.
Preparing to unpack .../libc++1_1%3a10.0-50~exp1_amd64.deb ...
Unpacking libc++1:amd64 (1:10.0-50~exp1) ...
Selecting previously unselected package libglfw3:amd64.
Preparing to unpack .../libglfw3_3.3.2-1_amd64.deb ...
Unpacking libglfw3:amd64 (3.3.2-1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/libpng12-0_1.2.54-1ubuntu1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
mona@goku:~/research/code/PyTorch-Encoding$


$ sudo dpkg --configure -a
Setting up libopenjpeg5:amd64 (1:1.5.2-3.1) ...
Setting up libglfw3:amd64 (3.3.2-1) ...
Setting up libvpx3:amd64 (1.5.0-2ubuntu1) ...
Setting up libopencv-core2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
Setting up libilmbase12:amd64 (2.2.0-11ubuntu2) ...
Setting up libopencv-imgproc2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
Setting up libva1:amd64 (1.7.0-1) ...
Setting up libcrystalhd3:amd64 (1:0.0~git20110715.fdd2f19-13build1) ...
Setting up libopencv-video2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
Setting up libopenexr22:amd64 (2.2.0-10ubuntu2) ...
Setting up libx264-148:amd64 (2:0.148.2643+git5c65704-1) ...
Setting up libavutil-ffmpeg54:amd64 (7:2.8.6-1ubuntu2) ...
Setting up libopencv-photo2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
Setting up libswresample-ffmpeg1:amd64 (7:2.8.6-1ubuntu2) ...
dpkg: dependency problems prevent configuration of libopencv-highgui2.4v5:amd64:
 libopencv-highgui2.4v5:amd64 depends on libpng12-0 (>= 1.2.13-4); however:
  Package libpng12-0:amd64 is not installed.

dpkg: error processing package libopencv-highgui2.4v5:amd64 (--configure):
 dependency problems - leaving unconfigured
Setting up libschroedinger-1.0-0:amd64 (1.0.11-2.1build1) ...
Setting up libjasper1:amd64 (1.900.1-debian1-2.4ubuntu1) ...
Setting up libx265-79:amd64 (1.9-3) ...
Setting up libopencv-ml2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
Setting up libc++abi1-10:amd64 (1:10.0.0-4ubuntu1) ...
Setting up libwebp5:amd64 (0.4.4-1) ...
Setting up libopencv-flann2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
dpkg: dependency problems prevent configuration of libopencv-objdetect2.4v5:amd64:
 libopencv-objdetect2.4v5:amd64 depends on libopencv-highgui2.4v5 (= 2.4.9.1+dfsg-1.5ubuntu1); however:
  Package libopencv-highgui2.4v5:amd64 is not configured yet.

dpkg: error processing package libopencv-objdetect2.4v5:amd64 (--configure):
 dependency problems - leaving unconfigured
Setting up libbluray1:amd64 (1:0.9.2-2) ...
Setting up libswscale-ffmpeg3:amd64 (7:2.8.6-1ubuntu2) ...
Setting up libopencv-features2d2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
Setting up python-is-python2 (2.7.17-4) ...
dpkg: dependency problems prevent configuration of libopencv-contrib2.4v5:amd64:
 libopencv-contrib2.4v5:amd64 depends on libopencv-highgui2.4v5 (= 2.4.9.1+dfsg-1.5ubuntu1); however:
  Package libopencv-highgui2.4v5:amd64 is not configured yet.
 libopencv-contrib2.4v5:amd64 depends on libopencv-objdetect2.4v5 (= 2.4.9.1+dfsg-1.5ubuntu1); however:
  Package libopencv-objdetect2.4v5:amd64 is not configured yet.

dpkg: error processing package libopencv-contrib2.4v5:amd64 (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of libopencv-legacy2.4v5:amd64:
 libopencv-legacy2.4v5:amd64 depends on libopencv-highgui2.4v5 (= 2.4.9.1+dfsg-1.5ubuntu1); however:
  Package libopencv-highgui2.4v5:amd64 is not configured yet.

dpkg: error processing package libopencv-legacy2.4v5:amd64 (--configure):
 dependency problems - leaving unconfigured
Setting up libc++1-10:amd64 (1:10.0.0-4ubuntu1) ...
Setting up libopencv-calib3d2.4v5:amd64 (2.4.9.1+dfsg-1.5ubuntu1) ...
Setting up libavcodec-ffmpeg56:amd64 (7:2.8.6-1ubuntu2) ...
Setting up libavformat-ffmpeg56:amd64 (7:2.8.6-1ubuntu2) ...
dpkg: dependency problems prevent configuration of python-opencv:
 python-opencv depends on libopencv-contrib2.4v5; however:
  Package libopencv-contrib2.4v5:amd64 is not configured yet.
 python-opencv depends on libopencv-highgui2.4v5; however:
  Package libopencv-highgui2.4v5:amd64 is not configured yet.
 python-opencv depends on libopencv-legacy2.4v5; however:
  Package libopencv-legacy2.4v5:amd64 is not configured yet.
 python-opencv depends on libopencv-objdetect2.4v5; however:
  Package libopencv-objdetect2.4v5:amd64 is not configured yet.

dpkg: error processing package python-opencv (--configure):
 dependency problems - leaving unconfigured
Setting up libc++1:amd64 (1:10.0-50~exp1) ...
Setting up open3d-viewer (0.12.0) ...
Processing triggers for libc-bin (2.31-0ubuntu9.1) ...
Errors were encountered while processing:
 libopencv-highgui2.4v5:amd64
 libopencv-objdetect2.4v5:amd64
 libopencv-contrib2.4v5:amd64
 libopencv-legacy2.4v5:amd64
 python-opencv