Ubuntu 17.10下Flash插件已安装但无法正常使用求助

Hey Peter, I know how critical this is for your university courses—let’s work through this step by step to get Flash working again. Since you did a fresh install of 17.10 (instead of an upgrade), there might be leftover configs or incorrect package installs causing the problem.

Fixing Flash in Firefox #

First, let’s wipe any existing Flash installations that might be broken, then start fresh:

1. Completely remove old Flash packages
   Open a terminal and run these commands to purge any leftover Flash files:

   sudo apt purge adobe-flashplugin flashplugin-installer
   sudo apt autoremove
   

2. Enable the Multiverse repository (required for Flash)
   Flash is hosted in Ubuntu’s Multiverse repo, so make sure it’s active:

   sudo add-apt-repository multiverse
   sudo apt update
   

3. Reinstall the official Flash plugin
   Install the stable Adobe Flash package for Firefox:

   sudo apt install adobe-flashplugin
   

4. Verify and configure Firefox

   • Restart Firefox, then type about:addons in the address bar. Go to the Plugins tab, find Shockwave Flash, and set it to Always Activate.
   • To double-check, visit a Flash test page and grant permission when prompted. If it still doesn’t load, try refreshing the page—sometimes the initial auth doesn’t trigger properly.
   • Optional: For persistent activation, type about:config in Firefox, search for plugin.state.flash, and set its value to 2 (this bypasses the click-to-activate prompt for Flash).

Fixing Flash in Chromium #

Chromium uses a different Flash plugin (PPAPI) than Firefox, so we need to install the correct package:

1. Purge old Chromium/Flash packages
   Clear out any existing Chromium Flash components:

   sudo apt purge chromium-browser-l10n chromium-codecs-ffmpeg-extra pepperflashplugin-nonfree
   sudo apt autoremove
   

2. Reinstall Chromium and its Flash plugin
   Install the required packages and update Flash to the latest version:

   sudo apt install chromium-browser pepperflashplugin-nonfree
   sudo update-pepperflashplugin-nonfree --install
   

3. Configure Chromium

   • Restart Chromium, then type chrome://plugins in the address bar.
   • Find Adobe Flash Player, check the box next to Always allowed to run, and click Enable if it’s disabled.
   • Test with a Flash page—you should now see the plugin load without issues.

Additional Troubleshooting Tips #

• Update your system: Run sudo apt update && sudo apt upgrade to ensure all system libraries are up to date—outdated dependencies can break plugin functionality.
• Test with a clean browser profile: Sometimes corrupted user profiles cause issues. For Firefox, run firefox -P and create a new profile; for Chromium, run chromium-browser --user-data-dir=/tmp/test-chromium-profile. If Flash works here, your original profile has a problem (you can migrate bookmarks/settings to the new profile).

I’ve used these steps to fix similar Flash issues on Ubuntu 17.10 before, so they should get your plugins working again for your courses.

内容的提问来源于stack exchange，提问作者Peter