Working in Knoppix ram/usb on a desktop computer, I got into some sort of file quagmire. It started when I was experimenting with an ubuntu iso file which I copied into the knoppix usb downloads folder "/home/knoppix/Downloads"
(I'm intending to install ubuntu on one of the HDDs on same computer, and I since found that I should do that on a separate usb drive, which I'm doing now).

Trouble is, I extracted the ubuntu iso inside the knoppix downloads folder with some sort of "archive" app (a right-click option). Now that I don't need them, these unpacked folders (such as ".disk", "boot", "casper", "dists", "install", etc) can't be deleted. I get this error message when I try to delete them: "filesystem.squashfs.gpg: Error removing file /home/knoppix/Downloads/casper/filesystem.squashfs.gpg: Permission denied"

I tried rebooting knoppix to see if that would help, but it didn't. As a test, I tried copying and deleting a Libreoffice doc in the same folder, and that worked fine. Also I was able to easily delete the original iso and even the extracted "read-me" type text docs. So the problem appears to be just for the extracted folders from the iso.

Ideas on how to get rid of these unwanted and rather large folders?

on command line depending on how far back to the base dir you want to go
start a file manger using your terminal and sudo this way it has root permissions then use the FM to delete what you need.

1 members found this post helpful.

Thanks BW-userx. I used the <sudo pcmanfm> approach and was then easily able to delete the folders.