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I am using Ubuntu MATE 16.04. I think I had some broken packages which caused apt-get upgrade to return the following error:

Do you want to continue? [Y/n] y

(Reading database ... 386704 files and directories currently installed.)

Removing nvidia-prime (0.8.2) ...

/var/lib/dpkg/info/nvidia-prime.postrm: 79: /var/lib/dpkg/info/nvidia-prime.postrm: lsb_release: not found

dpkg: error processing package nvidia-prime (--remove):

 subprocess installed post-removal script returned error exit status 127

Errors were encountered while processing:

 nvidia-prime

E: Sub-process /usr/bin/dpkg returned an error code (1)

Any help would be appreciated.

lsb-release package is not installed, so you are getting an error message when sudo apt-get upgrade is trying to access it.

Download lsb-release_9.20160110_all.deb from the official Ubuntu website.

Open the terminal, change directories using cd to the directory where you downloaded lsb-release_9.20160110_all.deb and install it with the following command:

sudo apt install ./lsb-release_9.20160110_all.deb

Create a new sources.list file.

sudo mkdir -p /etc/apt/  

cd /etc/apt/    

sudo touch sources.list 

Open /etc/apt/sources.list for editing in nano text editor with the following command:

sudo nano etc/apt/sources.list  

Add the following lines to sources.list.

deb http://archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse  

deb http://archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu xenial-security main restricted universe multiverse  

deb http://archive.canonical.com/ubuntu xenial partner 

The instructions for using the nano editor are always found at the bottom of every page. Press the keyboard combination Ctrl+O and after that press Enter to save the file being edited. Press the keyboard combination Ctrl+X to exit nano.

Update the list of available software and fix broken packages.

sudo apt update  

sudo apt install lsb-release python3.5-minimal 

sudo apt install python3 nvidia-prime  

sudo reboot     

If sudo apt update is successful, try to run sudo apt upgrade again.

sudo apt upgrade