Bug report: Error installing mactex

[wlhlm]

Description of issue

Trying to install mactex fails:

$ brew cask install mactex
==> Downloading http://mirror.ctan.org/systems/mac/mactex/mactex-20161009.pkg
Already downloaded: /Users/wlhlm/Library/Caches/Homebrew/Cask/mactex--20161009.pkg
==> Verifying checksum for Cask mactex
==> Running installer for mactex; your password may be necessary.
==> Package installers may write to any location; options such as --appdir are ignored.
Password:
==> installer: Package name is MacTeX-2016
==> installer: Installing at base path /
==> installer: The install failed (The Installer encountered an error that caused the installation to fail. Contact the sof
Error: no implicit conversion of Array into String
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/exceptions.rb:71:in `concat'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/exceptions.rb:71:in `to_s'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:150:in `message'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:150:in `rescue in process'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:143:in `process'
/usr/local/Homebrew/Library/Homebrew/cask/cmd/brew-cask.rb:8:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/Homebrew/Library/Homebrew/brew.rb:24:in `require?'
/usr/local/Homebrew/Library/Homebrew/brew.rb:100:in `<main>'

I'm aware of #7946, but wasn't able to fix the problem by updating hombrew cask.

Output of brew cask <command> --verbose

==> Downloading http://mirror.ctan.org/systems/mac/mactex/mactex-20161009.pkg
Already downloaded: /Users/wlhlm/Library/Caches/Homebrew/Cask/mactex--20161009.pkg
==> Verifying checksum for Cask mactex
==> Running installer for mactex; your password may be necessary.
==> Package installers may write to any location; options such as --appdir are ignored.
==> installer: Package name is MacTeX-2016
==> installer: Installing at base path /
==> installer:PHASE:Preparing for installation…
==> installer:PHASE:Preparing the disk…
==> installer:PHASE:Preparing MacTeX-2016…
==> installer: The install failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.)
Error: no implicit conversion of Array into String
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/exceptions.rb:71:in `concat'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/exceptions.rb:71:in `to_s'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:150:in `message'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:150:in `rescue in process'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:143:in `process'
/usr/local/Homebrew/Library/Homebrew/cask/cmd/brew-cask.rb:8:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/Homebrew/Library/Homebrew/brew.rb:24:in `require?'
/usr/local/Homebrew/Library/Homebrew/brew.rb:100:in `<main>'

Output of brew doctor

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

Warning: Your Xcode (7.0) is outdated.
Please update to Xcode 7.2.1 (or delete it).
Xcode can be updated from the App Store.

Output of brew cask doctor

$ brew cask doctor
==> macOS Release:
10.10.5
==> Hardware Architecture:
intel-64
==> Ruby Version:
2.0.0-p481
==> Ruby Path:
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
==> Homebrew Version:
Homebrew 1.0.7-9-g04ccba5
Homebrew/homebrew-core (git revision fa7b2; last commit 2016-10-11)
==> Homebrew Executable Path:
/usr/local/bin/brew
==> Homebrew Cellar Path:
/usr/local/Cellar
==> Homebrew Repository Path:
/usr/local/Homebrew
==> Homebrew Origin:
https://github.com/Homebrew/brew.git
==> Homebrew-Cask Version:
Homebrew-Cask 1.0.7-9-g04ccba5
caskroom/homebrew-cask (git revision a3e9; last commit 2016-10-11)
==> Homebrew-Cask Install Location:
<NONE>
==> Homebrew-Cask Staging Location:
/usr/local/Caskroom
==> Homebrew-Cask Cached Downloads:
/Users/wlhlm/Library/Caches/Homebrew/Cask
8 files, 2.8G (warning: run "brew cask cleanup")
==> Homebrew-Cask Default Tap Path:
/usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask
==> Homebrew-Cask Alternate Cask Taps:
/usr/local/Homebrew/Library/Taps/caskroom/homebrew-fonts
/usr/local/Homebrew/Library/Taps/caskroom/homebrew-versions
==> Homebrew-Cask Default Tap Cask Count:
3376
==> Contents of $LOAD_PATH:
/usr/local/Homebrew/Library/Homebrew/cask/lib
/usr/local/Homebrew/Library/Homebrew
/Library/Ruby/Site/2.0.0
/Library/Ruby/Site/2.0.0/x86_64-darwin14
/Library/Ruby/Site/2.0.0/universal-darwin14
/Library/Ruby/Site
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0/x86_64-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0/universal-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/x86_64-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin14
==> Contents of $RUBYLIB Environment Variable:
<NONE>
==> Contents of $RUBYOPT Environment Variable:
<NONE>
==> Contents of $RUBYPATH Environment Variable:
<NONE>
==> Contents of $RBENV_VERSION Environment Variable:
<NONE>
==> Contents of $CHRUBY_VERSION Environment Variable:
<NONE>
==> Contents of $GEM_HOME Environment Variable:
<NONE>
==> Contents of $GEM_PATH Environment Variable:
<NONE>
==> Contents of $BUNDLE_PATH Environment Variable:
<NONE>
==> Contents of $PATH Environment Variable:
PATH="/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/usr/local/Homebrew/Library/Taps/homebrew/homebrew-emacs/cmd:/usr/local/Homebrew/Library/Homebrew/cask/cmd:/usr/local/Homebrew/Library/Homebrew/shims/scm"
==> Contents of $SHELL Environment Variable:
SHELL="/usr/local/bin/zsh"
==> Contents of Locale Environment Variables:
LANG="en_US.UTF-8"
LC_CTYPE="en_US.UTF-8"
==> Running As Privileged User:
No

[reitermarkus]

Does installing the pkg manually work?

[wlhlm]

Yes, works without a problem.

[reitermarkus]

It is installing fine for me, I cannot reproduce the error you are getting:

The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.

[jawshooah]

@wlhlm Try brew cask uninstall --force mactex && brew cask install mactex

[adidalal]

Closing due to lack of reply