Ubuntu 14.04安装Python失败：执行sudo apt-get命令遇依赖问题求助

Hey there, let's tackle this dependency issue you're facing with python-software-properties on Ubuntu 14.04. The root cause here is that Ubuntu 14.04 reached its end-of-life (EOL) years ago, so the default software sources are no longer maintained—this is why python-pycurl can't be found. Here's how to fix it step by step:

Step 1: Switch to Old Releases Repository #

First, we need to update your system's software sources to point to Ubuntu's old-releases archive, which still hosts packages for EOL versions.

• Backup your current sources list (just in case):

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

• Edit the sources list with a text editor (we'll use nano here):

  sudo nano /etc/apt/sources.list
  

• Replace all existing content with these lines (they point to the trusty/14.04 old releases):

  deb http://old-releases.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
  deb http://old-releases.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
  deb http://old-releases.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
  deb http://old-releases.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse

• Save and exit: Press Ctrl+O, hit Enter, then Ctrl+X.

Step 2: Update APT Cache #

Refresh your package cache to pull in data from the new sources:

sudo apt-get update

You might see some warnings about expired keys—this is normal for EOL releases, and we can proceed anyway.

Step 3: Fix Broken Packages #

Run this command to let APT automatically resolve and fix any broken dependencies:

sudo apt-get -f install

Step 4: Reinstall python-software-properties #

Now try installing the package again:

sudo apt-get install python-software-properties

Alternative: Manually Install python-pycurl (If Step 4 Fails) #

If the above steps don't work, you can manually grab the python-pycurl deb package and install it first:

• For 64-bit systems:

  wget http://old-releases.ubuntu.com/ubuntu/pool/universe/p/pycurl/python-pycurl_7.19.3-0ubuntu3_amd64.deb
  sudo dpkg -i python-pycurl_7.19.3-0ubuntu3_amd64.deb
  

• For 32-bit systems:

  wget http://old-releases.ubuntu.com/ubuntu/pool/universe/p/pycurl/python-pycurl_7.19.3-0ubuntu3_i386.deb
  sudo dpkg -i python-pycurl_7.19.3-0ubuntu3_i386.deb
  

Then run the install command for python-software-properties again.

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