Seq.base compile error or tar extract error when Opam installs Merlin

Ecosystem
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1

Version: Opam 2.1.2

I’m trying to install Merlin in order to enable ocaml-merlin on Flycheck since I’m using Emacs. There’s an issue as it’s tries to compile seq.base:

$ opam install merlin
The following actions will be performed:
  ∗ install seq               base    [required by yojson]
  ∗ install merlin-lib        4.9-500 [required by merlin]
  ∗ install ocamlfind         1.9.6   [required by dot-merlin-reader]
  ∗ install yojson            2.1.0   [required by merlin]
  ∗ install dot-merlin-reader 4.9     [required by merlin]
  ∗ install merlin            4.9-500
===== ∗ 6 =====
Do you want to continue? [Y/n] y

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
⬇ retrieved dot-merlin-reader.4.9  (cached)
⬇ retrieved merlin.4.9-500  (cached)
⬇ retrieved merlin-lib.4.9-500  (cached)
⬇ retrieved ocamlfind.1.9.6  (cached)
⬇ retrieved yojson.2.1.0  (cached)

#=== ERROR while compiling seq.base ===========================================#
Sys_error("/home/user/.opam/repo/default/packages/seq/seq.base/files/seq.install: No such file or directory")


<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build seq base
└─ 
╶─ No changes have been performed

I’ve cleaned up the Opam cache by running $ opam clean and updated the repositories with $ opam update --repositories default, then ran the installation again and Opam printed:

$ opam install merlin
The following actions will be performed:
  ∗ install seq               base    [required by yojson]
  ∗ install merlin-lib        4.9-500 [required by merlin]
  ∗ install ocamlfind         1.9.6   [required by dot-merlin-reader]
  ∗ install yojson            2.1.0   [required by merlin]
  ∗ install dot-merlin-reader 4.9     [required by merlin]
  ∗ install merlin            4.9-500
===== ∗ 6 =====
Do you want to continue? [Y/n] y

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
⬇ retrieved merlin.4.9-500  (https://opam.ocaml.org/cache)
⬇ retrieved dot-merlin-reader.4.9  (https://opam.ocaml.org/cache)
[ERROR] Failed to extract archive /home/user/.opam/repo/default.tar.gz: "/usr/bin/tar xfz /home/user/.opam/repo/default.tar.gz -C /tmp/opam-3125-f9ba29" exited with code 2.
        Run `opam update --repositories default` to fix the issue

#=== ERROR while compiling seq.base ===========================================#
OpamStd.OpamSys.Exit(10)


<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ ⬇ fetch merlin-lib 4.9-500
│ λ build seq        base
└─ 
╶─ No changes have been performed

I’m not sure what to do. I’ve searched for seq.base but found no interesting results.