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The following is the message I get when trying to install anything on Ubuntu, right now.

Reading package lists... Done
Building dependency tree 
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 cuda-libraries-dev-10-1 : Depends: libcublas-dev (>= 10.1.0.105) but it is not going to be installed
 cuda-samples-10-1 : Depends: libcublas-dev (>= 10.1.0.105) but it is not going to be installed
 cuda-visual-tools-10-1 : Depends: libcublas-dev (>= 10.1.0.105) but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

I tried apt --fix-broken install, I tried purge, I tried sudo apt install -f, and also sudo apt-get remove --purge '^nvidia-.*' and I am not able to get anything done. It all fails.

I tired rebooting in recovery mode to try and uninstall the drivers.

This is my output for apt --fix-broken install:

Reading package lists... Done
Building dependency tree 
Reading state information... Done
Correcting dependencies... Done
The following package was automatically installed and is no longer required:
 libnvidia-common-390
Use 'sudo apt autoremove' to remove it.
The following additional packages will be installed:
 libcublas-dev
The following NEW packages will be installed:
 libcublas-dev
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
8 not fully installed or removed.
Need to get 0 B/39.9 MB of archives.
After this operation, 115 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
(Reading database ... 735451 files and directories currently installed.)
Preparing to unpack .../libcublas-dev_10.1.0.105-1_amd64.deb ...
Unpacking libcublas-dev (10.1.0.105-1) ...
dpkg: error processing archive /var/cache/apt/archives/libcublas-dev_10.1.0.105-1_amd64.deb (--unpack):
 trying to overwrite '/usr/include/cublas_v2.h', which is also in package nvidia-cuda-dev 9.1.85-3ubuntu1
dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/libcublas-dev_10.1.0.105-1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Can someone please help me? I've been spending hours trying to fix this. I tried installing cuda 10.1 along with an already present installation of cuda 9.1. This turned out to be a mistake. My older cuda installation works fine, but dpkg completely broke, and it is not working anymore.

Without uninstalling the previous version of cuda, I directly tried installing the 10.1 version (by mistake). I tried installing by following the link given here: https://developer.nvidia.com/cuda-downloads. I selected: Linux -> x86_64 -> Ubuntu -> 18.04 -> deb(network) And I followed the instructions over there.

I am not able to install anything, because of this.

Okay, to back out of this, run the following commands:

sudo rm /etc/apt/sources.list.d/cuda.list
sudo apt-get clean
sudo apt-get update
sudo apt install -f

This will uninstall the nvidia repo you downloaded and installed and hopefully the system will fix itself now. If not, we can fix it manually fairly easily by following the error messages.

You may need to do some more purging and we may have to use dpkg to do that manually so please post any more errors. Thanks!