Hey there, sorry to hear you're hitting dependency roadblocks while trying to install Java 8 on Debian 8 Jessie—let’s walk through the fixes step by step. The root issue here is that Debian 8 is an end-of-life (EOL) release, so its original package sources are no longer actively maintained, leading to broken dependency links. Here’s how to resolve this:

Step 1: Switch to Debian Archive Sources #

First, we need to update your system’s package sources to point to Debian’s archived repositories (since the official Jessie sources are no longer available):

1. Back up your current sources.list file to avoid losing existing config:

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

2. Edit the sources list with your favorite text editor (we’ll use nano here):

   sudo nano /etc/apt/sources.list
   

3. Replace all existing content with the archived Jessie sources:

   deb http://archive.debian.org/debian/ jessie main contrib non-free
   deb-src http://archive.debian.org/debian/ jessie main contrib non-free
   deb http://archive.debian.org/debian-security/ jessie/updates main contrib non-free
   deb-src http://archive.debian.org/debian-security/ jessie/updates main contrib non-free
   

4. Save and exit nano (press Ctrl+O, then Enter, then Ctrl+X).
5. Add a config to skip expired package signature checks (since archive sources have old signatures):

   echo "Acquire::Check-Valid-Until \"false\";" | sudo tee /etc/apt/apt.conf.d/10-nocheckvalid
   

6. Update your package index with the new sources:

   sudo apt-get update
   

Step 2: Fix Existing Dependency Issues #

Now that your sources are working, run the auto-fix command to resolve any pending dependency problems:

sudo apt-get -f install

This command will attempt to download and install any missing packages that are blocking your Java installation.

Step 3: Install OpenJDK 8 #

With dependencies fixed, install OpenJDK 8 JRE again:

sudo apt-get install openjdk-8-jre

If you still hit dependency conflicts here, try using aptitude (a more flexible package manager for resolving tricky dependencies):

1. Install aptitude first:

   sudo apt-get install aptitude
   

2. Use aptitude to install Java 8:

   sudo aptitude install openjdk-8-jre
   

   aptitude will present you with possible solutions to resolve conflicts—follow the prompts to select the one that works best (usually option 1 or 2 to adjust dependencies).

Step 4: Verify the Installation #

Once the install finishes, confirm Java is working with:

java -version

You should see output similar to this (version numbers might vary slightly):

openjdk version "1.8.0_382"
OpenJDK Runtime Environment (build 1.8.0_382-8u382-ga-1~deb8u1-b01)
OpenJDK 64-Bit Server VM (build 25.382-b01, mixed mode)

That’s it—you should now have Java 8 up and running on your Debian 8 system!

内容的提问来源于stack exchange，提问作者Elenesski