Ubuntu 16.04中snapd不可用及apt命令报错求助

Hey there, let’s work through this snapd and apt issue on your Ubuntu 16.04 system step by step. Since you mentioned snap --version isn’t responding and apt commands are throwing errors, we’ll start by wiping the corrupted snapd installation, then tackle lingering apt dependency problems.

Step 1: Fully Remove Corrupted Snapd Components #

First, we’ll purge all snapd-related packages to eliminate any damaged files or configurations:

sudo apt purge snapd snap-confine ubuntu-core-launcher squashfs-tools

Then clean up leftover dependencies and cached packages:

sudo apt autoremove && sudo apt clean

Step 2: Reinstall Snapd Fresh #

Now let’s install a clean copy of snapd and its dependencies:

sudo apt update
sudo apt install snapd

Once the installation finishes, verify if snap is working again by running:

snap --version

You should now see normal output with snapd, snap, and series version details.

Step 3: Resolve Apt Dependency Issues #

If sudo apt upgrade and sudo apt -f install still fail after fixing snapd, let’s fix dpkg’s incomplete package configurations first:

sudo dpkg --configure -a

This command will reconfigure any packages that were left in a broken state.

Next, refresh the apt cache and retry the fix command:

sudo apt clean
sudo apt update
sudo apt -f install

Now try running the system upgrade again:

sudo apt upgrade

Step 4: Check for Corrupted Kernel Packages #

Since you confirmed you can see installed kernel images with dpkg --get-selections | grep linux-image | grep -v deinstall, let’s verify these packages aren’t corrupted. Run this to check their status:

sudo dpkg -l | grep linux-image

Look for packages marked with iU (unconfigured) or rc (residual config). If you spot any issues, reinstall the problematic kernel package. For example, if linux-image-4.4.0-210-generic is broken:

sudo apt install --reinstall linux-image-4.4.0-210-generic

Step 5: Handle Ubuntu 16.04 EOL Source Problems #

Remember that Ubuntu 16.04 reached end-of-life (EOL) in April 2021, so default apt sources might no longer be available. If you get "404 Not Found" errors during apt update, switch to the old releases repository:

1. Back up your current sources list:

   sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
   

2. Edit the sources file with nano:

   sudo nano /etc/apt/sources.list
   

3. Replace every instance of http://archive.ubuntu.com/ubuntu/ (or regional variants like us.archive.ubuntu.com) with http://old-releases.ubuntu.com/ubuntu/
4. Save and exit (press Ctrl+O, hit Enter, then Ctrl+X)
5. Refresh the cache and retry fix commands:

   sudo apt update
   sudo apt -f install
   sudo apt upgrade
   

If you’re still hitting errors after these steps, sharing the exact error messages from apt -f install or apt upgrade would help narrow down the issue further.

内容的提问来源于stack exchange，提问作者Masroor