Install via Cask fails if Docker already installed

[PieterDC]

Bug Report

On Mac OS '10.13.5' with Docker '18.03.1-ce-mac65 (24312)' already installed:

$ brew cask install lando

Updating Homebrew...
==> Auto-updated Homebrew!
Updated 2 taps (homebrew/core, homebrew/cask).
==> Satisfying dependencies
==> Installing Cask dependencies: docker
==> Satisfying dependencies
==> Downloading https://download.docker.com/mac/stable/24312/Docker.dmg
######################################################################## 100.0%
==> Verifying checksum for Cask docker
==> Installing Cask docker
==> Creating Caskroom at /usr/local/Caskroom
==> We'll set permissions properly so we won't need sudo in the future.
Password:
==> Purging files for version 18.03.1-ce-mac65,24312 of Cask docker
Error: It seems there is already an App at '/Applications/Docker.app'.

I might try to install Lando without Cask.

[tanc]

I just bumped into this too. You can remove your Docker app in /Applications/ and then run the brew command again.

Another 'problem' is that after the large Docker.dmg download brew downloads the Lando disk image which includes Docker (lando-v3.0.0-beta.47.dmg). Is there any possibility of not bundling Docker with Lando or having brew download Lando on its own somehow?

[tanc]

Another potential issue with brew installation method is that lando depends on docker which means that brew will install the latest stable docker version and will not install the version of docker that comes with Lando. I'm not sure why Lando packages Docker alongside the Lando code but I would imagine it is to control the version and ensure a tested Docker version works with a specific Lando version.

[jerrylow]

Thanks @tanc - removing /Applications/Docker.app was the only way to proceed via homebrew.

[dustinleblanc]

We don't directly maintain the brew formula for Lando, so technically this isn't supported. We might automate updates to the formula at some future date, but until we do that, just consider it ymmv / caveat emptor territory.

[davidmyersdev]

For others that stumble upon this... I ran into this same problem without a Docker.app install. Instead, I ran into this problem after trying to run brew install --cask docker after running brew install docker. Running brew remove docker first solved it for me.

[tim-hub]

For others that stumble upon this... I ran into this same problem without a Docker.app install. Instead, I ran into this problem after trying to run brew install --cask docker after running brew install docker. Running brew remove docker first solved it for me.

yeah, same issue, it seems like a conflict between homebrew formula docker and homebrew cask docker(-dekstop)

[IllyaMoskvin]

Running brew remove docker for whatever reason did not work for me.

I had to delete the following items manually:

sudo rm /opt/homebrew/etc/bash_completion.d/docker
sudo rm /opt/homebrew/share/zsh/site-functions/_docker
sudo rm /opt/homebrew/share/fish/vendor_completions.d/docker.fish

[SanderMuller]

Running brew remove docker for whatever reason did not work for me.

I had to delete the following items manually:

sudo rm /opt/homebrew/etc/bash_completion.d/docker
sudo rm /opt/homebrew/share/zsh/site-functions/_docker
sudo rm /opt/homebrew/share/fish/vendor_completions.d/docker.fish

I had the same issue, but brew uninstall docker --force worked for me

[bmelton-mdsol]

I had the same issue, but brew uninstall docker --force worked for me

Same here. I was having a ton of problems with "Error: It seems there is already a binary at /usr/local/bin/docker", but there was no such folder/file. This worked for me

[rhberro]

Running brew remove docker for whatever reason did not work for me.

I had to delete the following items manually:

sudo rm /opt/homebrew/etc/bash_completion.d/docker
sudo rm /opt/homebrew/share/zsh/site-functions/_docker
sudo rm /opt/homebrew/share/fish/vendor_completions.d/docker.fish

Running brew cleanup and brew autoremove after removing using the command brew remove docker does that for you! This way you don't need to manually remove these files, but it also works!

[Vickysnipe]

i had similar issue, struggled for a while but brew uninstall docker --force worked for me.
after that i used brew install --cask docker and i was able to install cask docker and get the desktop app.