问题1：RuntimeError: Failed to find C compiler. Please specify via CC environment variable.

解决方案如下：

apt-get install  --no-upgrade build-essential

问题2：执行问题1的解决方案再次报错如下：

Temporary failure resolving 'archive.ubuntu.com'

解决方案如下：

先看看主机的网：

ping -c 4 8.8.8.8

如果 ping 成功，说明网络连接正常，可以继续排查 DNS 问题。
如果 ping 不通，说明网络有问题，检查网络配置（如虚拟机网络、Docker 网络或代理设置）。

问题通常与 DNS 解析失败有关，手动设置 DNS 服务器： 编辑 vim /etc/resolv.conf 文件，添加以下内容：

nameserver 8.8.8.8
nameserver 8.8.4.4

验证 DNS 是否生效： 尝试 ping 或解析一个域名：

nslookup archive.ubuntu.com
ping archive.ubuntu.com

至此解决此问题，并依次解决了问题1。

问题3：
Unsloth 2025.2.15 patched 28 layers with 28 QKV layers, 28 O layers and 28 MLP layers.
Traceback (most recent call last):
  File "/home/lzw/llm/demo/test.py", line 144, in <module>
    trainer = SFTTrainer(
  File "/root/anaconda3/envs/unsloth/lib/python3.10/site-packages/unsloth/trainer.py", line 203, in new_init
    original_init(self, *args, **kwargs)
  File "/home/lzw/llm/demo/unsloth_compiled_cache/UnslothSFTTrainer.py", line 917, in __init__
    model.for_training()
  File "/root/anaconda3/envs/unsloth/lib/python3.10/site-packages/unsloth/models/llama.py", line 2759, in for_training
    del model._unwrapped_old_generate
  File "/root/anaconda3/envs/unsloth/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1799, in __delattr__
    super().__delattr__(name)
AttributeError: _unwrapped_old_generate

解决方案如下：

 FastLanguageModel.for_training(model) #加入此行代码，将模型转为训练模式

FastLanguageModel.for_training(model) #加入此行代码，将模型转为训练模式
model = FastLanguageModel.get_peft_model(
    model,
    r = 16, # Choose any number > 0 ! Suggested 8, 16, 32, 64, 128
    
    target_modules = ["q_proj", "k_proj", "v_proj", "o_proj",
                      "gate_proj", "up_proj", "down_proj",],
    lora_alpha = 16,
    lora_dropout = 0, # Supports any, but = 0 is optimized
    bias = "none",    # Supports any, but = "none" is optimized
    # [NEW] "unsloth" uses 30% less VRAM, fits 2x larger batch sizes!
    use_gradient_checkpointing = "unsloth", # True or "unsloth" for very long context
    random_state = 3407,
    use_rslora = False,  # We support rank stabilized LoRA
    loftq_config = None, # And LoftQ
)

但是你会发现在jupyter中却还是会报同样的错误，我想那是因为模型先进行了推理，然后进行了训练，这个前面的推理过程影响到了后面的训练过程，所以方法就是重新获取一次模型即可。具体如下，在下面第二段的代码前面加入如下代码即可。

model, tokenizer = FastLanguageModel.from_pretrained(
    model_name = "/home/lzw/llm/demo/hugginface1", # 这里改成你本地模型，以我的为例，我已经huggingface上的模型文件下载到本地。
    max_seq_length = max_seq_length,
    dtype = dtype,
    load_in_4bit = load_in_4bit,
)

model = FastLanguageModel.get_peft_model(
    model,
    r=16,
    target_modules=[
        "q_proj",
        "k_proj",
        "v_proj",
        "o_proj",
        "gate_proj",
        "up_proj",
        "down_proj",
    ],
    lora_alpha=16,
    lora_dropout=0,
    bias="none",
    use_gradient_checkpointing="unsloth",  # True or "unsloth" for very long context
    random_state=3407,
    use_rslora=False,
    loftq_config=None,
)