Omnisharp Can't Find Mono Installation #5518

killbox998 · 2023-01-05T17:57:52Z

Issue Description

Omnisharp can't find the mono installation even though in is installed

Steps to Reproduce

Install mono
uncheck "Use Modern Net"
relaunch vscode

Expected Behavior

Omnisharp Launches

Actual Behavior

Omnisharp asks to install mono

Logs

OmniSharp log

OmniSharp failed to start because of missing requirements.

C# log

Environment information

Mono Version(From Command Line)

TLS: __thread

SIGSEGV: altstack

Notifications: epoll

Architecture: amd64

Disabled: none

Misc: softdebug

Interpreter: yes

LLVM: yes(610)

Suspend: hybrid

GC: sgen (concurrent by default)

MsBuild Info(From Command Line)

16.6.0.60701

VSCode version: 1.74.2
C# Extension: 1.25.2

Mono Information

OmniSharp using mono: 6.12.0

Dotnet Information

.NET SDK (反映任何 global.json): Version: 6.0.112 Commit: d311a58ee1

运行时环境:
OS Name: fedora
OS Version: 37
OS Platform: Linux
RID: fedora.37-x64
Base Path: /usr/lib64/dotnet/sdk/6.0.112/

global.json file:
Not found

Host:
Version: 6.0.12
Architecture: x64
Commit: 02e45a41b7

.NET SDKs installed:
6.0.112 [/usr/lib64/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.12 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.12 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

Download .NET:
https://aka.ms/dotnet-download

Learn about .NET Runtimes and SDKs:
https://aka.ms/dotnet/runtimes-sdk-info

Visual Studio Code Extensions

Extension	Author	Version
cmake	twxs	0.0.17
cmake-tools	ms-vscode	1.12.27
cpptools	ms-vscode	1.13.9
cpptools-extension-pack	ms-vscode	1.3.0
cpptools-themes	ms-vscode	2.0.0
csharp	ms-dotnettools	1.25.2

slacktracer · 2023-01-06T18:56:56Z

Did you have any luck, @killbox998?

I'm in the same boat. For almost two days now.

I tried downgrading (based on this: https://stackoverflow.com/questions/74370803/omnisharp-requires-a-complete-install-of-mono-including-msbuild) and got this:

Starting OmniSharp server at 06/01/2023, 16:08:29
    Target: /home/slacktracer/My project/My project.sln

OmniSharp server started with Mono 6.12.0.
    Path: /home/slacktracer/.vscode/extensions/ms-dotnettools.csharp-1.25.0-linux-x64/.omnisharp/1.39.0/omnisharp/OmniSharp.exe
    PID: 12431

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on fedora 37.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        Checking the 'DOTNET_ROOT' environment variable to find a .NET SDK
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to /usr/lib64/dotnet/dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 0 MSBuild instance(s)
Could not locate MSBuild instance to register with OmniSharp.

UPDATE

I downgraded C# Extension to 1.24.4 and set useGlobalMono to "always".

It gave me some intellisense. Not as much I have on Windows it seems... I'm using it for Unity so I get "Input" as a suggestion, for example, now.

It is a very unsatisfactory "solution".

I'm still going check to how much intellisense it is giving. It did not suggest basic stuff like Start, Update etc.

Don't know if you want for Unity though. Perhaps you will find this option useful.

(I'm on Fedora 37 by the way.)

rpmccarter · 2023-01-07T05:23:50Z

Also running into the same issue, Omnisharp v1.25.2, macOS v12.4, happy to give more info if needed but assuming @killbox998 's report is sufficient

esklarski · 2023-01-12T18:23:10Z

I too had the same problem when upgrading from 1.25.0 this morning. Both 1.25.1 and 1.25.2 fail to find the msbuild install. I've tried specifying a path in settings but I am not sure what file/s the extension is even looking for.

I'm on Fedora 36.

Treeways · 2023-01-19T01:36:04Z

I'm running Fedora 37 in an FNA project. IntelliSense doesn't work at all (I can still run builds because of my tasks.json configuration). This was on an older project that I used Omnisharp on prior to using 1.25.0, on an older project that was already working. I'm being told to install the complete version of mono, despite having mono-complete installed properly on my system from here.

After downgrading to 1.23.17 (as per the Stack Overflow link above) everything is working properly again.

GlacierFox · 2023-01-20T12:21:02Z

I'm also getting this problem using Fedora 37 @Treeway7 .

I'm also using Unity. I've downgraded to 1.25.0 and things seem to be working as far as I know. I'm pretty new to C# so I haven't actually built anything substantial to test anything.

luisvasq · 2023-01-26T04:18:39Z

I was having the same issue on Fedora 36, but it's now working for me on 1.25.4. 🎉 Probably resolved after #5484.

I faced another issue with "Downloading package 'OmniSharp for Linux (Mono / x64)'" hanging on startup (same as #1028). In case it is helpful, I fixed it by going to the extension's package.json file (~/.vscode/extensions/ms-dotnettools.csharp-1.25.4-linux-x64/package.json), and finding the entry in runtimeDependencies that matched my system. Then, pointed the url to one of the official releases in the omnisharp-roslyn repo.

In my case, my system's entry was https://github.com/OmniSharp/omnisharp-vscode/blob/09b09bc069e4eefea65ef6d9bb436a0809e5ded5/package.json#L297-L316 and I changed the url's value to https://github.com/OmniSharp/omnisharp-roslyn/releases/download/v1.39.4/omnisharp-linux-x64.zip.

esklarski · 2023-01-26T17:43:25Z

Installed 1.25.4 this morning and the problem has disappeared for my system. I guess #5484 was the trouble.

slacktracer · 2023-01-31T00:12:55Z

After I saw updates to this issue I went back to it hopeful but 1.25.4 did not help me. It seems I have everything in place but the issue persists...

Last metadata expiration check: 0:00:23 ago on Mon 30 Jan 2023 21:03:58 -03.
Package mono-complete-6.12.0.158-0.xamarin.1.epel8.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

Well, at least I did not get my hopes too high. 🤷🏼‍♀️

UPDATE: I installed msbuild, rebooted and the error/issue was gone. Not sure I have intellisense working yet tough.

There is a msbuild "inside" dotnet. You can run dotnet msbuild and see for yourself if you have dotnet installed but I did not know, still don't, if it is possible to point to this one...

Treeways · 2023-02-09T19:55:55Z

Omnisharp is working for me now on 1.25.4, running Mono and FNA!

BrunoKatz · 2023-03-28T08:35:06Z

similar issue here (Linux Mint 21 Vanessa base: Ubuntu 22.04 jammy) downgrading as mentioned in issue below seems to have helped for the moment:
#5443 (comment)

ffxsam · 2023-04-03T18:58:34Z

This issue is still not fixed for macOS arm64?

NotTimIsReal · 2023-04-11T07:51:35Z

I also get this issue in version 1.25.4 on an intel mac, I had to downgrade back to 1.25.0

thekoc · 2023-05-29T02:04:40Z

It'll complain "Mono Installation" for the initial launch but works fine if I restart VSCode. Any ideas?

MickaelNeves · 2023-05-30T10:02:00Z

Same issue running v1.25.7

nevyn · 2023-06-04T20:37:09Z

Same issue on v1.25.8 on Ubuntu 20.04. Complains about missing mono install on every launch even though I have latest version installed.

chrisbenincasa · 2023-06-14T15:19:03Z

Getting this on Fedora 38 w/ version 1.25.9

EDIT: I think this is actually because it can't find msbuild. Many of the examples for a mono path show Mac OS paths. For Linux, I don't see an individual msbuild executable installed anywhere after installing mono-complete on my machine

JoeRobich · 2023-06-15T21:13:43Z

Fedora's mono-complete package does not include msbuild unfortunately. I did find a way to install it on Fedora 36 which may still be an option, see #5232 (comment).

chrisbenincasa · 2023-06-15T21:36:02Z

Interestingly I got this working by aliasing dotnet msbuild to msbuild

esklarski · 2023-06-15T22:55:45Z

I've since upgraded through to Fedora 38 and the CentOs mono package keeps working fine.

quadristan · 2023-06-25T15:23:28Z

I did what @chrisbenincasa did, and the extension still cannot find mono installation ( On Fedora 38)

❯ mono --version
Mono JIT compiler version 6.12.0.182 (tarball Thu Jan 19 23:19:38 UTC 2023)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
        TLS:           __thread
        SIGSEGV:       altstack
        Notifications: epoll
        Architecture:  amd64
        Disabled:      none
        Misc:          softdebug 
        Interpreter:   yes
        LLVM:          supported, not enabled.
        Suspend:       hybrid
        GC:            sgen (concurrent by default)

❯ msbuild --version
MSBuild version 17.4.4+8e9cb2952 for .NET
17.4.4.31401%    

❯ dnf list installed | grep mono-complete
mono-complete.x86_64  6.12.0-11.fc38                      @fedora

The extension works fine in 1.24.0 with "omnisharp.useGlobalMono":"always"

davl3232 · 2023-07-08T17:56:51Z

Downgrading to 1.25.0 worked for me on an M1 mac. This video shows the whole setup that worked for me:
https://www.youtube.com/watch?v=3_OejJf_mN8

WDeenik · 2023-07-26T10:18:03Z

I'm running into this issue as well on an ARM mac. After a full restart (quitting vscode in the dock) everything works like it should, but after normally closing the window and reopening it, I get this error.

For now I'm reverting back to 1.25.0 as well.

JoeRobich · 2024-11-14T06:10:21Z

A lot has changed with O# and mono since this issue was opened. If you are still having problems, please open a new issue at https://github.com/omnisharp/omnisharp-roslyn/issues

ericdrobinson mentioned this issue May 17, 2023

I get a popup to install latest Mono (have previously installed it) #5642

Closed

dibarbet added the OmniSharp label Jun 6, 2023

chrisbenincasa mentioned this issue Jun 14, 2023

/api/v1/album Exception - Sequence contains more than one element Lidarr/Lidarr#3784

Open

2 tasks

JoeRobich closed this as not planned Won't fix, can't repro, duplicate, stale Nov 14, 2024

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Omnisharp Can't Find Mono Installation #5518

Omnisharp Can't Find Mono Installation #5518

killbox998 commented Jan 5, 2023

slacktracer commented Jan 6, 2023 •

edited

Loading

rpmccarter commented Jan 7, 2023

esklarski commented Jan 12, 2023 •

edited

Loading

Treeways commented Jan 19, 2023 •

edited

Loading

GlacierFox commented Jan 20, 2023

luisvasq commented Jan 26, 2023

esklarski commented Jan 26, 2023

slacktracer commented Jan 31, 2023 •

edited

Loading

Treeways commented Feb 9, 2023

BrunoKatz commented Mar 28, 2023

ffxsam commented Apr 3, 2023 •

edited

Loading

NotTimIsReal commented Apr 11, 2023

thekoc commented May 29, 2023

MickaelNeves commented May 30, 2023

nevyn commented Jun 4, 2023 •

edited

Loading

chrisbenincasa commented Jun 14, 2023 •

edited

Loading

JoeRobich commented Jun 15, 2023

chrisbenincasa commented Jun 15, 2023

esklarski commented Jun 15, 2023

quadristan commented Jun 25, 2023 •

edited

Loading

davl3232 commented Jul 8, 2023

WDeenik commented Jul 26, 2023 •

edited

Loading

JoeRobich commented Nov 14, 2024

Omnisharp Can't Find Mono Installation #5518

Omnisharp Can't Find Mono Installation #5518

Comments

killbox998 commented Jan 5, 2023

Issue Description

Steps to Reproduce

Expected Behavior

Actual Behavior

Logs

OmniSharp log

C# log

Environment information

slacktracer commented Jan 6, 2023 • edited Loading

rpmccarter commented Jan 7, 2023

esklarski commented Jan 12, 2023 • edited Loading

Treeways commented Jan 19, 2023 • edited Loading

GlacierFox commented Jan 20, 2023

luisvasq commented Jan 26, 2023

esklarski commented Jan 26, 2023

slacktracer commented Jan 31, 2023 • edited Loading

Treeways commented Feb 9, 2023

BrunoKatz commented Mar 28, 2023

ffxsam commented Apr 3, 2023 • edited Loading

NotTimIsReal commented Apr 11, 2023

thekoc commented May 29, 2023

MickaelNeves commented May 30, 2023

nevyn commented Jun 4, 2023 • edited Loading

chrisbenincasa commented Jun 14, 2023 • edited Loading

JoeRobich commented Jun 15, 2023

chrisbenincasa commented Jun 15, 2023

esklarski commented Jun 15, 2023

quadristan commented Jun 25, 2023 • edited Loading

davl3232 commented Jul 8, 2023

WDeenik commented Jul 26, 2023 • edited Loading

JoeRobich commented Nov 14, 2024

slacktracer commented Jan 6, 2023 •

edited

Loading

esklarski commented Jan 12, 2023 •

edited

Loading

Treeways commented Jan 19, 2023 •

edited

Loading

slacktracer commented Jan 31, 2023 •

edited

Loading

ffxsam commented Apr 3, 2023 •

edited

Loading

nevyn commented Jun 4, 2023 •

edited

Loading

chrisbenincasa commented Jun 14, 2023 •

edited

Loading

quadristan commented Jun 25, 2023 •

edited

Loading

WDeenik commented Jul 26, 2023 •

edited

Loading