CODEWITHSUNDEEP
ubuntuerlangphoenix-framework
Fillype Farias
Fillype Farias

Reputation: 660

Remove or downgrade Erlang from Ubuntu

I installed the Erlang/OPT 20 in my OS and the phoenix framework show the following error message:

When I run the command:

 iex -S mix

I get:

Erlang/OTP 20 [erts-9.2] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:10] [hipe] [kernel-poll:false]

** (Version.InvalidRequirementError) ~> 1.3 or ~> 1.4
    (elixir) lib/version.ex:159: Version.match?/3
    (mix) lib/mix/local.ex:100: Mix.Local.check_elixir_version_in_ebin/1
    (elixir) lib/enum.ex:645: Enum."-each/2-lists^foreach/1-0-"/2
    (elixir) lib/enum.ex:645: Enum.each/2
    (mix) lib/mix/local.ex:50: Mix.Local.append_archives/0
    (mix) lib/mix/cli.ex:8: Mix.CLI.main/1

I had the Erlang 19 before and after the upgrade it broke the phoenix. To downgrade to the older version I tried to install it manually after download from the official website I couldn't replace with the installer (the system understands that the newer is better so don't ask to substitute).

Then I tried to remove it completely using this command line:

sudo apt-get purge erlang

and for my surprise it doens't remove:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package 'erlang' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.

"Package 'erlang' is not installed, so not removed"

Upvotes: 3

Views: 7763

Answers (2)

Shree Prakash
Shree Prakash

Reputation: 2314

I solved by following way

upgrading/downgrade erlang version

https://github.com/asdf-vm/asdf

upgrading/downgrade elixir version

$ git clone https://github.com/elixir-lang/elixir.git

$ cd elixir

$ git checkout v1.6 (v1.4,v1.5,v1.7) //for downgrading or upgrading

$ sudo apt-get install make

$ make clean test

$ sudo make install

$ elixir -v

Upvotes: 2

Fillype Farias
Fillype Farias

Reputation: 660

I solved this problem with this command lines:

wget https://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb       
sudo dpkg -i erlang-solutions_1.0_all.deb
sudo apt-get update
sudo apt-get install esl-erlang=1:19.3.6

I got from this post

Upvotes: 5

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