You face a cryptic error. It doesn’t make sense. You changed one URL to point at a different repository in the installation script and now the installer failed saying the repository isn’t trusted.<\/p>\n\n\n\n
Check the source code. Find the section you changed, no the key was set right before this line and your repository mirror would use the same key.<\/p>\n\n\n\n
Go onto the target system itself, sure enough the key isn’t present. Check if you manually add it do things work?<\/p>\n\n\n\n
They do. OK, now we need to figure out why the code block isn’t being executed. This is a bash script and it looks like the URL substitution code added the wrong whitespace at the front.<\/p>\n\n\n\n
Then you remember yes, whitespace can be wrong. Think you have spaces, when it could be a tab. Miss some little dots and it might be unprintable ASCII characters. They look fine in the text editor but wreak havoc on the parser.<\/p>\n\n\n\n
Go back to the regex and determine what is matching and not substituting correctly…<\/p>\n\n\n\n
If this sounds familiar you may be sucked into technical troubleshooting. Every new problem encountered pushes things down the stack another layer as you focus on the new problem.<\/p>\n\n\n\n
“I need to complete this quick task…the main server isn’t accessible.”<\/p>\n\n\n\n
“No biggie, I’ll use the cli tool…oh it has a broken dependency”<\/p>\n\n\n\n
“Ok, I’ll update things…oops, networking is broken entirely”<\/p>\n\n\n\n
“No, problem I have an alternate, hang on need to get to my password manager.”<\/p>\n\n\n\n
If you go more than three layers deep without making progress, it is time to go back to the original problem. Otherwise you fall into the depth-first search trap and might end up spending all of your time on some obscure technical problem that doesn’t matter.<\/p>\n\n\n\n
With red teaming, this is quite common as young pentesters have lots of technical chops and think every problem has a technical solution…they may but at what cost? This is a first principle of influence energy, what is the lowest-cost method to achieve a goal. Sometimes deep dives are needed, but you must always evaluate other options first and prioritize simplicity.<\/p>\n","protected":false},"excerpt":{"rendered":"
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