Opam on Windows/WSL/Ubuntu fails with bwrap issue

[andrewjkennedy]

If I install (e.g. dune, but other packages are similar) on WSL running Ubuntu, I get

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The compilation of ocaml-base-compiler failed at "/home/akenn/.opam/opam-init/hooks/sandbox.sh build ./configure -prefix /home/akenn/.opam/default -with-debug-runtime".

#=== ERROR while compiling ocaml-base-compiler.4.07.1 =========================#
# context     2.0.3 | linux/x86_64 |  | https://opam.ocaml.org#dc8e74d5
# path        ~/.opam/default/.opam-switch/build/ocaml-base-compiler.4.07.1
# command     ~/.opam/opam-init/hooks/sandbox.sh build ./configure -prefix /home/akenn/.opam/default -with-debug-runtime
# exit-code   1
# env-file    ~/.opam/log/ocaml-base-compiler-9658-c61e7b.env
# output-file ~/.opam/log/ocaml-base-compiler-9658-c61e7b.out
### output ###
# bwrap: Creating new namespace failed, likely because the kernel does not support user namespaces.  bwrap must be installed setuid on such systems.

The issue seems to be with bwrap.

[rjbou]

bwrap is not supported by WSL. You can find more information in these issues #3505 and ocaml/opam-repository#12050, and especially on how to be able to use opam in this cases in this comment ocaml/opam-repository#12050 (comment).
I close this issue as it is duplicated. Thanks for the report!