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opam 2.0 has been release for a while. I was wondering if there is any repository for installing it on Ubuntu (18.04 LTS as of Oct 2018).

I searched on bing.com and couldn't find any mention. The OPAM website itself says the current supported version is 1.2.2, but listed under the "Other" category,

Distribution Latest OPAM Maintainer Notes

Ubuntu Linux (PPA) 2.0.0 Anil Madhavapeddy (@avsm) Anil's official OPAM PPA Travis and discuss post

But the linked website therein show no recent activity (with the last being 151 weeks ago). Trying sudo add-apt-repository ppa:avsm/ppa also gives an error below.

Does anyone know how to use the repository correctly?

$ sudo add-apt-repository ppa:avsm/ppa
 Latest stable versions of OCaml and OPAM.
 More info: https://launchpad.net/~avsm/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-c to cancel adding it.

...

Err:12 http://ppa.launchpad.net/avsm/ppa/ubuntu bionic Release                 
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/avsm/ppa/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
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According to the documentation, the avsm ppa now contains the current stable version of opam (2.x), as of Jan 2019:

sudo add-apt-repository ppa:avsm/ppa
sudo apt update
sudo apt install opam

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