Kali gns3 uBridge is not available

[Cx330-dev]

My OS version: Kali-Rolling 2024.3
GNS3 version: 2.2.49

I tried to pull the cable for the c3600 device, and gns3-gui returned an error message:
Error while creating link: uBridge is not available, path doesn't exist, or you just installed GNS3 and need to restart your user session to refresh user permissions.

I suspected that there was a problem with gns3-server, so I opened another command line and ran gns3-server. It stopped after running some python script commands.

┌──(cx330㉿kali)-[~]
└─$ gns3server 
2024-10-14 10:42:19 INFO run.py:218 GNS3 server version 2.2.49
2024-10-14 10:42:19 INFO run.py:220 Copyright (c) 2007-2024 GNS3 Technologies Inc.
2024-10-14 10:42:19 INFO run.py:223 Config file /home/cx330/.config/GNS3/2.2/gns3_server.conf loaded
2024-10-14 10:42:19 INFO run.py:236 HTTP authentication is enabled with username 'admin'
2024-10-14 10:42:19 INFO run.py:242 Running with Python 3.12.6 and has PID 60539
2024-10-14 10:42:19 INFO run.py:248 Using system certificate store for SSL connections
2024-10-14 10:42:19 INFO run.py:78 Current locale is zh_CN.UTF-8
2024-10-14 10:42:19 INFO web_server.py:338 Starting server on localhost:3080
2024-10-14 10:42:19 INFO __init__.py:70 Load controller configuration file /home/cx330/.config/GNS3/2.2/gns3_controller.conf
2024-10-14 10:42:19 INFO __init__.py:74 Controller is starting
2024-10-14 10:42:19 INFO __init__.py:320 Installing base configs in '/home/cx330/GNS3/configs'
2024-10-14 10:42:19 INFO __init__.py:333 Installing built-in disks in '/home/cx330/GNS3/images/QEMU'
2024-10-14 10:42:19 INFO __init__.py:255 Comparing controller version 2.2.49 with config version 2.2.49
2024-10-14 10:42:19 INFO __init__.py:263 Built-in appliances are installed in '/home/cx330/.local/share/GNS3/appliances'
2024-10-14 10:42:19 INFO compute.py:64 Create compute local
2024-10-14 10:42:19 INFO compute.py:364 Connecting to compute 'local'
2024-10-14 10:42:19 CRITICAL web_server.py:88 Could not start the server: [Errno 98] error while attempting to bind on address ('127.0.0.1', 3080): [errno 98] address already in use

I suspected that port 3080 might be occupied, which caused gns3-server to not connect properly. So I checked the usage of port 3080 through lsof, which showed that port 3080 was being used by gns3-server.

┌──(cx330㉿kali)-[~]
└─$ lsof -i:3080
COMMAND     PID  USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
gns3      57260 cx330   12u  IPv6 2919164      0t0  TCP localhost:37660->localhost:3080 (ESTABLISHED)
gns3      57260 cx330  133u  IPv6 2897025      0t0  TCP localhost:58570->localhost:3080 (ESTABLISHED)
gns3serve 57381 cx330    7u  IPv4 2897008      0t0  TCP localhost:3080 (LISTEN)
gns3serve 57381 cx330    8u  IPv6 2897009      0t0  TCP localhost:3080 (LISTEN)
gns3serve 57381 cx330    9u  IPv4 2897020      0t0  TCP localhost:55664->localhost:3080 (ESTABLISHED)
gns3serve 57381 cx330   10u  IPv6 2918033      0t0  TCP localhost:3080->localhost:37660 (ESTABLISHED)
gns3serve 57381 cx330   11u  IPv6 2895125      0t0  TCP localhost:3080->localhost:58570 (ESTABLISHED)
gns3serve 57381 cx330   19u  IPv4 2897023      0t0  TCP localhost:3080->localhost:55664 (ESTABLISHED)

I searched and found that someone had raised this issue in gns 2.1, but I checked the issue he raised and found that his situation did not match mine. Here is the link to his issue for your reference. #1247

[grossmj]

uBridge is an additional software that you must install.

Also, how have you installed GNS3? Do you run the GNS3 server as a service already?

Thanks.

[Cx330-dev]

I installed it according to this official tutorial , I started it by running gns3 directly in the terminal, and according to the feedback from lsof, I should have enabled the gns3server program.

(The following operation is an accidental touch, please ignore it)

[Cx330-dev]

(The above operation is an error, please don't need to ignore it)

I try to start separately, start the GNS3Server in the terminal, and then start the GNS3-GUI. When the new path is built, the path is not allowed, but my file path/home/CX330/desktop/2 is a legal path. At the default path, he can start normally, but still unable to pull the line, report an error
Error while creating link: uBridge is not available, path doesn't exist, or you just installed GNS3 and need to restart your user session to refresh user permissions.

[smart2128]

You can find something useful here

[grossmj]

@Cx330-dev we don't official package uBridge (and GNS3) for Kali Linux so the best is to follow the steps listed in the document provided by @smart2128 to manually install it.