I'm trying to install grub-customizer on Ubuntu 20.04 and it's not working.  This is what I've tried (as suggested by multiple websites):  $ sudo add-apt-repository ppa:danielrichter2007/grub-customizer  $ sudo apt update $ sudo apt install grub-customizer   It doesn't seem to find the package:  Err:13 http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu focal Release   404  Not Found [IP: 91.189.95.83 80]   This is the output from the last command:  Reading package lists... Done Building dependency tree        Reading state information... Done E: Unable to locate package grub-customizer   I've read in a few places that people have been able to install this on 20.04 correctly. What am I doing wrong?  Thanks
How do I get to the Universe Repository in supported versions of Ubuntu?
$\max(\{n: n+5 | n^5 + 5\})$ What is the maximum value of $n$ if $n + 5$ divides $n^5 + 5$, $n$ being a natural number? I tried to solve by binomial theorem but it failed. Adding new group layer with ArcPy? How to edit command line in full screen editor in ZSH? I was viewing  question in the Android app. As shown in the below screenshot, while the top shows "4 answers", the bottom button will ask to "View 6 Answers". After checking the question, there are indeed six answers to the aforementioned question.    I am using Android 4.3 with the 0.1.64 version of the app.    EDIT: The changes to the UI made this question obsolete. I had recently taken the hard drive out of my computer so that I could install a bigger one. But when I reconnected it to the computer, all the files on the E:\ partition and some of the files on the C:\ partition had strange names like TTv5yV5354$YVC5Wy on them. I did on one occasion move an electromagnet near the drive. Could that have caused this? 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How to disable javascript modal popup ads Playing a remote movie on the remote computer Find Items in one column that are not in another column I have two columns in Excel, and I want to find (preferably highlight) the items that are in column B but not in column A.   What's the quickest way to do this? $_SERVER["REMOTE_ADDR"] gives server IP rather than visitor IP