我的操作系统是 Debian 9.1 和 Cinnamon 3.2.7。我从包管理器安装了 Audacious（版本 3.7.2），并想要更新到最新版本。根据这些说明，我尝试通过输入以下命令进行更新：
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt update
sudo apt install audacious
提示按 Enter 后，我收到以下输出：
gpg: keybox '/tmp/tmpseyl6p36/pubring.gpg' created
gpg: /tmp/tmpseyl6p36/trustdb.gpg: trustdb created
gpg: key 531EE72F4C9D234C: public key "Launchpad webupd8" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1
gpg: no valid OpenPGP data found.
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
self.run()
File "/usr/lib/python3.5/threading.py", line 862, in …