Have you tried just using the stock "Format Wii System Memory" (or whatever the proper name) button in the Wii Settings? This goes a long way and I believe wipes the Homebrew Channel. Unless you installed anything suspect, that should remove anything that could possibly affect the next user. You might want to put the latest HackMii installer in your apps folder before you do anything else and useby LupintheThird - Homebrew General
I spent like an hour or so the other night trying to track down a mirror of the linux.zip file (the others, like the .elf file, are still on that Google Drive link) to no avail. But I contacted Linus on YouTube (of all places) while this forum was down and he put up a new mirror! Here's the address:by LupintheThird - Wii Linux