Problem about installing CUDA 11 toolkit in Ubuntu 18.04 LTS

I tried to install the Cuda toolkit on my server, but it always fails with this error. I’m new to Linux. Can anyone help with this problem?
Here is the error log.

[INFO]: Driver not installed.
[INFO]: Checking compiler version…
[INFO]: gcc location: /usr/bin/gcc

[INFO]: gcc version: gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)

[INFO]: Initializing menu
[WARNING]: Unable to write to directory: /usr/share/applications/
[INFO]: Setup complete
[INFO]: Components to install:
[INFO]: Driver
[INFO]: 515.43.04
[INFO]: Executing NVIDIA-Linux-x86_64-515.43.04.run --ui=none --no-questions --accept-license --disable-nouveau --no-cc-version-check --install-libglvnd 2>&1
[INFO]: Finished with code: 256
[ERROR]: Install of driver component failed.
[ERROR]: Install of 515.43.04 failed, quitting

I used the default setting.