由于ubuntu24.04与windows驱动不同，未集成nvlink驱动，且nvlink的驱动fabricmanager版本可能和显卡驱动本身不同，就无法激活nvlink：
用 nvidia-smi nvlink -s会发现未激活
问题1 nvlink 未激活(Inactive)
1. 先用systemctl status nvidia-fabricmanager.service查看报错
发现驱动接口和驱动版本不匹配：
fabric manager NVIDIA GPU driver interface version 535.216.01 dont match with driver version 535.183.01
2. 删除过高的接口interface版本 （Remove all nvidia-fabricmanager）
sudo apt remove nvidia-fabricmanager*
3.下载对应驱动的nvlink驱动版本（Download the exact nvidia-fabricmanager version corresponding to the Driver Version）：
https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2204/x86_64/nvidia-fabricmanager-530_530.30.02-1_amd64.deb
我这下载的是：
1. nvidia-fabricmanager-535_535.183.01-1_amd64.deb2.nvidia-fabricmanager-dev-535_535.183.01-1_amd64.deb
4.安装驱动接口 (Install nvidia-fabricmanager)
sudo dpkg -i nvidia-fabricmanager-530_530.30.02-1_amd64.deb
或者
sudo apt install ./nvidia-fabricmanager-530_530.30.02-1_amd64.deb
5. 启动工厂管理服务 (Start nvidia-fabricmanager)
sudo systemctl daemon-reload
sudo systemctl start nvidia-fabricmanager
问题2 报错：“NV_WARN_NOTHING_TO_DO”
同样用systemctl status nvidia-fabricmanager.service查看报错如上，
这个是硬件没检查到nvlink，重启服务器即可
Reference
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https://blog.csdn.net/qq_27815483/article/details/140514420?spm=1001.2101.3001.6650.3&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ECtr-3-140514420-blog-139062954.235%5Ev43%5Epc_blog_bottom_relevance_base6&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ECtr-3-140514420-blog-139062954.235%5Ev43%5Epc_blog_bottom_relevance_base6&utm_relevant_index=6
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https://forums.developer.nvidia.com/t/problem-starting-fabricmanager-in-ubuntu-20-04-lts/255215/7