Issue

When trying to unzip a zip file, it displays the error message unsupported compression method 99.

Solution

The compression method 99 refers to Adavanced Encryption Standard encryption, which is not supported by unzip. However, you can use 7zip to unzip your password-protected file.

In Debian, do the followings:

# Install the full version 7zip.
sudo apt-get install p7zip-full
 
# Unzip your file.
7z  x  your-file.zip
 
# Or unzip your password protected file.
7z  x  -pPASSWORD  your-file.zip