如何命名 /etc/apt/sources.list.d/ 中的文件以在没有警告的情况下被忽略？

Question

N: Ignoring file 'cloudera.list_' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'opera.list_' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
...
N: Ignoring file 'tor.list_' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension

如何正确地“注释掉”那里的文件？

Answer 1

cat >> /etc/apt/apt.conf.d/98ignore_extensions << \EOF
# Follow the pattern to add more extensions to ignore.
Dir::Ignore-Files-Silently:: "\.gz$";
Dir::Ignore-Files-Silently:: "\.save$";
Dir::Ignore-Files-Silently:: "\.distUpgrade$";
Dir::Ignore-Files-Silently:: "\.list_$";
EOF