Xubuntu 16.04启动过慢求助：loader阶段耗时过长如何解决？

Hey there, that 51-second loader stage is definitely way out of the ordinary—let's figure out what's going on and get your boot time back to normal. Since you switched from Arch to Xubuntu, your boot loader is almost certainly GRUB, so we'll focus on that first.

Common Causes & Fixes #

1. GRUB Menu Wait Time Set Too Long #

This is the most likely culprit. GRUB might be configured to wait far longer than necessary for you to select a boot option. Here's how to fix it:

• Open the GRUB config file with your favorite text editor (I use nano for simplicity):

  sudo nano /etc/default/grub
  

• Look for the line starting with GRUB_TIMEOUT. If it's set to something like 50, that's exactly your problem. Change it to a shorter value—2 or 3 seconds works great for most people:

  GRUB_TIMEOUT=2
  

• While you're here, set GRUB_TIMEOUT_STYLE=hidden if you don't need to see the menu every boot (it'll still pop up if you hold Shift during startup).
• Save the file (Ctrl+O in nano) and exit (Ctrl+X), then update GRUB to apply the changes:

  sudo update-grub
  

• Reboot and check if the loader time drops.

2. GRUB Stuck Detecting Disks/UUIDs #

Sometimes GRUB struggles to recognize disk UUIDs or takes too long to scan connected drives. Let's troubleshoot this:

• First, check if your disk has any health issues. Run a quick check with:

  smartctl -a /dev/sda  # Replace /dev/sda with your main disk identifier
  

  (You might need to install smartmontools first with sudo apt install smartmontools.)
• If the disk checks out, regenerate your initramfs (the initial RAM disk GRUB uses) to fix any corrupted or outdated files:

  sudo update-initramfs -u -k all
  

• Then re-update GRUB with sudo update-grub and reboot to test.

3. BIOS/UEFI Settings Issues #

HP laptops sometimes have quirky BIOS settings that slow down boot. Let's tweak those:

• Restart your laptop and press the BIOS key (usually F10 for HP models) to enter settings.
• Disable PXE Boot: Look for network boot options and turn them off—GRUB might be waiting for a non-existent network connection.
• Enable Fast Boot (UEFI Only): If you're using UEFI mode, find the "Fast Boot" option and turn it on (this skips unnecessary hardware checks during startup).
• Set Hard Drive as First Boot Device: Ensure your main SSD/HDD is at the top of the boot order, so GRUB loads immediately instead of scanning other devices.
• Update BIOS: Check HP's support site for your laptop model—sometimes BIOS updates fix boot-related bugs and delays.

4. Dig Into GRUB Logs for Exact Issues #

To get more details on what's slowing GRUB down, check the system logs right after a boot:

journalctl -b | grep -i grub

Look for lines mentioning delays, failed detections, or timeouts—these will point you to the exact root cause if the above fixes don't work.

Next Steps #

Start with the GRUB timeout fix first—it's the quickest and most common solution. If that doesn't cut it, move on to regenerating the initramfs and checking BIOS settings. If you still see slowdowns, share the output of the journalctl command and we can dig deeper.

内容的提问来源于stack exchange，提问作者francesco ceresa