diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 21316c8a8..d3efd7337 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -38,7 +38,9 @@ jobs:
         run: cargo install cargo-binutils
       - name: Install QEMU
         if: ${{ matrix.os == 'ubuntu-20.04' }}
-        run: sudo apt install qemu-utils
+        run: |
+         sudo apt update
+         sudo apt install qemu-utils
       - name: Install QEMU
         if: ${{ matrix.os == 'macos-latest' }}
         run: brew install qemu
diff --git a/docs/lab-1/guide/part-4.md b/docs/lab-1/guide/part-4.md
index 3483ade27..7415a2c51 100644
--- a/docs/lab-1/guide/part-4.md
+++ b/docs/lab-1/guide/part-4.md
@@ -74,7 +74,7 @@ __interrupt:
     mv a0, sp
     csrr a1, scause
     csrr a2, stval
-    jal 
+    jal  handle_interrupt
 
     .globl __restore
 # 离开中断
@@ -124,4 +124,4 @@ __restore:
     sret
 ```
 
-这样的话我们就完成了对当前执行现场保存，我们把 `Context` 以及 `scause` 和 `stval` 作为参数传入了 `handle_interrupt` 函数中，这是一个 Rust 编写的函数，后面我们将会实现它。
\ No newline at end of file
+这样的话我们就完成了对当前执行现场保存，我们把 `Context` 以及 `scause` 和 `stval` 作为参数传入了 `handle_interrupt` 函数中，这是一个 Rust 编写的函数，后面我们将会实现它。
diff --git a/docs/lab-1/guide/part-5.md b/docs/lab-1/guide/part-5.md
index 6d0863367..93dfb7f34 100644
--- a/docs/lab-1/guide/part-5.md
+++ b/docs/lab-1/guide/part-5.md
@@ -9,7 +9,7 @@
 {% label %}os/src/interrupt/handler.rs{% endlabel %}
 ```rust
 use super::context::Context;
-use riscv::register::stvec;
+use riscv::register::{scause::Scause, stvec};
 
 global_asm!(include_str!("../asm/interrupt.asm"));
 
@@ -97,4 +97,4 @@ pub extern "C" fn rust_main() -> ! {
 Hello rCore-Tutorial!
 mod interrupt initialized
 panic: 'Interrupted: Exception(Breakpoint)'
-```
\ No newline at end of file
+```