Hey there, sorry to hear you're stuck with Ubuntu freezing on your Dell Inspiron 15 7559—let's work through this step by step, since you're used to Windows and new to Linux. This is a super common issue with dual-graphics laptops like yours (it has Intel integrated + NVIDIA discrete GPU), so here's what to try first:

1. Add the nomodeset Boot Parameter (Immediate Fix for Live Environment) #

The freeze is almost certainly caused by Ubuntu trying to load the open-source Nouveau driver for your NVIDIA GPU, which doesn't play nice with some Dell models. Here's how to bypass it:

• When you see the Ubuntu startup menu (with "Try Ubuntu" and "Install Ubuntu" options), highlight either option and press the e key to enter edit mode.
• Look for the line starting with linux—scroll to the end of this line, right after quiet splash, add the text nomodeset (make sure to leave a space between splash and nomodeset).
• Press F10 or Ctrl+X to boot with this modified setting. You should now be able to enter the Live Ubuntu environment without freezing.

2. Install Ubuntu & Fix Drivers Permanently #

If you successfully get into the Live environment:

• Proceed with the Ubuntu installation as normal.
• After installation finishes, your first boot might still freeze. Repeat the nomodeset trick above to get into the installed system.
• Once logged in, open Software & Updates (search for it in the app menu), switch to the Additional Drivers tab.
• Select the latest stable NVIDIA proprietary driver (avoid the "X.Org X server" open-source option), click Apply Changes, and restart your laptop. You won't need the nomodeset parameter anymore after this.

3. Secondary Checks (If the Above Doesn't Work) #

• Verify Your Ubuntu ISO: Since you're on Windows, use a tool like HashTab to compare the SHA256 hash of your downloaded ISO with the official Ubuntu hash (listed on the download page). A corrupted ISO can cause random freezes.
• Recreate the Bootable USB: Use Rufus (a free Windows tool) to make your Ubuntu USB again. Choose "GPT partition scheme" (your Dell uses UEFI) and select "DD Image" mode instead of ISO mode—this avoids compatibility issues with some UEFI systems.
• Double-Check Secure Boot: Ensure Secure Boot is disabled in your Dell BIOS (press F2 during startup to enter BIOS). While some systems work with it enabled, disabling it simplifies driver setup for new Linux users.

内容的提问来源于stack exchange，提问作者francisco5em