Cannot open GNS3 after installing Virt-manager

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1

GNS3 Version: GNS3 v2.2.34
Operating System: Manjaro Linux (Kernel 5.19.16-2-MANJARO)

Hi. I’m having problem opening GNS3. It was working fine a few days ago. The last thing I did was install virt-manager; after that I tried to open GNS3 and there goes the issue (screenshot below)

I already tried restoring using timeshift with my backup from a month ago; but no luck, the problem still persist. Please help. I’m currently working on my certification. Appreciate the help.

GNS3 management console.
Running GNS3 version 2.2.34 on Linux (64-bit) with Python 3.10.7 Qt 5.15.6 and PyQt 5.15.7.
Copyright (c) 2006-2022 GNS3 Technologies.
Use Help -> GNS3 Doctor to detect common issues.

=> Local server process has stopped
Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 581, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 909, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 800, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (charset-normalizer 3.0.0 (/usr/lib/python3.10/site-packages), Requirement.parse('charset-normalizer<3.0,>=2.0'), {'aiohttp'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/gns3server", line 33, in <module>
    sys.exit(load_entry_point('gns3-server==2.2.34', 'console_scripts', 'gns3server')())
  File "/usr/bin/gns3server", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/lib/python3.10/importlib/metadata/__init__.py", line 171, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/lib/python3.10/site-packages/gns3server/main.py", line 29, in <module>
    import gns3server.utils.get_resource
  File "/usr/lib/python3.10/site-packages/gns3server/utils/get_resource.py", line 19, in <module>
    import pkg_resources
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3260, in <module>
    def _initialize_master_working_set():
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3234, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3272, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 583, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 596, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python3.10/site-packages/pkg_resources/__init__.py", line 795, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'charset-normalizer<3.0,>=2.0' distribution was not found and is required by aiohttp
2

Do you think I’m going to zoom this image so I can see what the hell it says? Use preformatted text.

Seriously, uploading images should be banned.

3

There are multiple packages with names starting with gns3.

All of them are AUR packages.

AUR (en) - Packages

If you installed something (virt-manager) then usually the system is also updated.

This may require you to have to rebuild your gns package (all AUR packages in general).

I cannot make heads or tails of the error messages - not helpful to me. :wink:

4

Sorry, my bad. I’ve edited the post. Errors are from the GNS3-Console window

5

Thanks for the reply. I’ve installed virt-manager before updating the system; then the problem occured. I’ve tried restoring from my backup a month ago using timeshift, after restoring, I’ve also tried updating my whole system first; then installing virt-manager again, but the issue still persist. I’ve also tried rebuilding the GNS3 package, same problem.

6

virt-manager installation just so happens to be installed at the same time, but it’s not the cause.

Usually it’s either a missing package, or even more common with GNS3 - a newer version of system package than in requirements.txt. You can see that on the last line:

DistributionNotFound: The 'charset-normalizer<3.0,>=2.0'

$ pacman -Q python-charset-normalizer
python-charset-normalizer 3.0.0-1

So you can try editing correct PKGBUILD (sometimes both -gui and -server needs the edit - check which one depends on charset-normalizer) and just add another sed line, changing required version.
You’ll see there are already other packages edited like that.

…anyways…

I wrote above before I went and check it myself. This won’t work this time, because it’s another package (python-aiohttp) that needs 'charset-normalizer<3.0,>=2.0' - it also says so in the last error message…if I would scroll to the right. :smiley:

So we could try editing python-aiohttp PKGBUILD and remove that requirement (setup.cfg:52: charset-normalizer >=2.0, < 3.0) and hope it would still work, which it probably wouldn’t.

So easiest for now is to just wait for new python-aiohttp version that will support python-charset-normalizer>=3.0 and until then downgrade to python-charset-normalizer 2.1.1. If you don’t have that version in cache anymore, then just install it from archlinux archive.

You should also open a bug report on arch bugtracker. (done)

1 Like
7

I found this solution and it worked on my system i was facing the same issue hopefully this will help you

pip uninstall gns3-gui
pip uninstall gns3-server
pip install gns3-gui
pip install gns3-server
1 Like
8

Just don’t open new posts here when you won’t be able to update your system, because you are stupidly using sudo pip.

9

It worked! Thanks man! You’re a life-saver!

@zbe is right though; I also learned the hard-way not to run pip as sudo.

10

Thanks, man. I’ve tried @raxor64 comment and it worked; this is also the solution I’ve received just now in GNS3 Forum. Appreciate the help.

11

Thanks for correcting me @zbe

1 Like
12

Apparently ‘<3.0’ requirement is arbitrary.

So a simple sed magically fixes everything, lolz. (have fun with pip) :stuck_out_tongue:

sed -i 's/charset-normalizer (<3.0,>=2.0)/charset-normalizer (<4.0,>=2.0)/' /usr/lib/python3.10/site-packages/aiohttp-3.8.3.dist-info/METADATA
1 Like