我最近将我的Fedora版本从25更新到28，并将Julia从0.6更新到0.7.0-alpha.99。
我现在正在尝试添加软件包，但不断收到相同的错误：
Pkg.add("PyPlot")
Updating registry at `~/.julia/registries/Uncurated`
Updating git-repo `https://github.com/JuliaRegistries/Uncurated.git`
Resolving package versions...
ERROR: Unsatisfiable requirements detected for package (unknown) [10745b16]:
(unknown) [10745b16] log:
├─(unknown) [10745b16] has no known versions!
└─found to have no compatible versions left with Distributions [31c24e10]
└─Distributions [31c24e10] log:
├─possible versions are: [0.1.0-0.1.4, 0.2.0-0.2.13, 0.3.0, 0.6.4-0.6.7, 0.7.0-0.7.6, 0.8.0-0.8.10, 0.9.0, 0.10.0-0.10.2, 0.11.0-0.11.1, 0.12.0-0.12.5, 0.13.0, 0.14.0-0.14.2, 0.15.0, 0.16.0-0.16.2] or uninstalled
└─restricted to versions 0.16.2 by an explicit requirement, leaving only versions 0.16.2
Stacktrace:
[1] #propagate_constraints!#61(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/GraphType.jl:1005
[2] propagate_constraints! at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/GraphType.jl:946 [inlined]
[3] #simplify_graph!#121(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/GraphType.jl:1460
[4] simplify_graph! at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/GraphType.jl:1460 [inlined]
[5] resolve_versions!(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/Operations.jl:291
[6] #add_or_develop#52(::Array{Base.UUID,1}, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/Operations.jl:973
[7] #add_or_develop at ./none:0 [inlined]
[8] #add_or_develop#8(::Symbol, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:39
[9] #add_or_develop at ./none:0 [inlined]
[10] #add_or_develop#7 at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:24 [inlined]
[11] #add_or_develop at ./none:0 [inlined]
[12] #add_or_develop#6 at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:23 [inlined]
[13] #add_or_develop at ./none:0 [inlined]
[14] #add_or_develop#5 at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:22 [inlined]
[15] #add_or_develop at ./none:0 [inlined]
[16] #add#9 at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:44 [inlined]
[17] add(::String) at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:44
[18] top-level scope at none:0
[19] macro expansion at /builddir/build/BUILD/julia/build/usr/share/julia/stdlib/v0.7/REPL/src/REPL.jl:116 [inlined]
[20] (::getfield(REPL, Symbol("##28#29")){REPL.REPLBackend})() at ./task.jl:257
其他软件包也会发生同样的事情(我尝试过IJulia，Conda，Distributions(。
你提到你升级到了0.7.0-alpha.99.0.7.0有一个稳定的版本，您应该使用它而不是 alpha 版本。您可以在 https://julialang.org/downloads/"以前的稳定版本(v0.7.0("下找到它。
一般来说，由于 Julia 正在快速变化，您应该始终使用 julialang.org 中的二进制文件，而不是操作系统包管理器中的二进制文件，因为它们几乎肯定不是最新的(就像您的情况一样(。
附带说明一下，从Julia 0.7开始添加软件包的方式略有变化。请参阅我的帖子：如何在Julia 1.0中安装软件包(UndefVarError：未定义Pkg(