Arch Linux

Description:
After the upgrade from libgit2 1:1.1.1-1 => 1:1.2.0-1 and libgit2-glib 0.99.0.1-5 => 0.99.0.1-6 the Julia package manager stopped working: updating the packages results in a GitError.

Additional info:
* package version: julia 1.6.3-1, libgit2 1:1.2.0-1 and libgit2-glib 0.99.0.1-6
* link to upstream bug report: this report might be related https://discourse.julialang.org/t/cannot-clone-on-julia-1-6-3/68757

Steps to reproduce:

1) Start Julia
2) Enter the Pkg REPL by pressing ] from the Julia REP
3) Execute "update" command

Result:

(@v1.6) pkg> update
Updating registry at `~/.julia/registries/General`
Updating git-repo `https://github.com/JuliaRegistries/General.git`
┌ Warning: Some registries failed to update:
│ — /home/simon/.julia/registries/General — failed to fetch from repo
└ @ Pkg.Types /build/julia/src/julia-1.6.3/usr/share/julia/stdlib/v1.6/Pkg/src/Types.jl:1246
Updating git-repo `https://github.com/JuliaMatrices/SpecialMatrices.jl.git`
ERROR: failed to fetch from https://github.com/JuliaMatrices/SpecialMatrices.jl.git, error: GitError(Code:ERROR, Class:Invalid, invalid version 0 on git_proxy_options)

Solution: One can downgrade libgit2 again, however, this breaks other programs such as "kate". In the current state, however, julia can barely be used productively.