Comment 66 for bug 1672424

I too have this issue with third-party .deb files. I have just installed 16.04 in UEFI with / and /home on their own partitions.

When I booted, I updated my box and was able to install Slack using the Software Center. After that, I went to install Chrome and it wouldn't work. Now, no third-party .deb files will install through the software center. I am able to install any default package from the Ubuntu Software Center but I am not able to install any .deb files unless I manually install them using:
`sudo dpkg -i PATH_TO_DEB_FILE.deb`

I have fully updated my system after a fresh install. I ran:

```
sudo apt update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release
Hit:4 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Get:6 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Get:7 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Fetched 306 kB in 0s (542 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
```

```
sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
```

```
sudo apt dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
```

This issue still persists. At this point, I can only install manually.