Ubuntu 16.04软件应用故障：snapd返回400错误，安装应用失败

Hey there, let's work through this Ubuntu Software problem you're facing on 16.04—those snapd 400 Bad Request errors are really frustrating, especially since everything worked perfectly before your last system update. Here are some tried-and-true fixes to get things back on track:

1. Check if Snapd is Running Properly #

First, let's confirm the state of the snapd service, since it's the core component behind Ubuntu Software's snap functionality. Open a terminal and run:

sudo systemctl status snapd

Look for the line that says active (running) near the top. If it shows failed or inactive, we'll need to kickstart it first.

2. Restart the Snapd Service #

Sometimes a simple restart can clear up glitches left behind by the system update. Run this command in the terminal:

sudo systemctl restart snapd

Wait 10-15 seconds, then recheck the status with the command from step 1 to make sure it's now active and running.

3. Reset Snapd to Default Configurations #

If restarting doesn't fix the 400 error, resetting snapd can resolve corrupted settings that might have been introduced during the update. This won't delete your installed snaps—just reset snapd's own configuration:

sudo snap reset snapd

4. Repair Broken System Packages #

It's common for partial or interrupted updates to leave packages in a broken state, which can mess with Ubuntu Software. Let's fix that:

sudo apt update
sudo apt install --fix-broken
sudo apt upgrade

These commands will refresh your package list, fix any broken dependencies, and finish any pending updates that might have caused the issue.

5. Clear Ubuntu Software's Cache #

Cached data from the app can sometimes conflict with updated system components. Let's clear out the old cache:

rm -rf ~/.cache/software-center/
rm -rf ~/.local/share/software-center/

Close any open Ubuntu Software windows, then launch the app again to test if it works.

6. Reinstall Ubuntu Software (Last Resort) #

If none of the above steps work, reinstalling the Ubuntu Software package can resolve deeper, persistent issues:

sudo apt purge software-center
sudo apt autoremove
sudo apt install software-center

Once the reinstall finishes, reboot your system and try using Ubuntu Software again.

I’ve helped several users fix this exact issue on 16.04 after updates—most of the time, steps 2-4 do the trick. If you run into any hiccups with a specific command, feel free to share what's happening!

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