Thanks. You say it is not an error, but the message is an error message with a warning. It says:
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! An error occurred
The following details are provided:
W: http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu/dists/jammy/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
So I clicked on the link you provided and made the change for just the Grub Customizer. I did not do them all. That brought up another error, which I did not record. But what I did was revert, using Timeshift, to before I installed Grub Customizer. This did not remove all the effects of Grub Customizer. What it did do though is revert the grub menu to how it was before. I'll deal with that separately.
I am back to the same error/warning. This occurs when I refresh in Update Manager. Update Manager still works though.
Now if I have another go at fixing this using that link, should I fix all the issues? I have that link now in another tab, so I can look at it and ask you a question:
viewtopic.php?f=42&t=377591. When I did
there were a few items. In that post, Qapla says to
Next, go into /etc/apt/sources.list.d and edit each of the PPA .list files.
So should I do all of them? The others aren't causing any problem.
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john@asus:~$ sudo apt-key list
[sudo] password for john:
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
/etc/apt/trusted.gpg
--------------------
pub rsa1024 2010-10-08 [SC]
59DA D276 B942 642B 1BBD 0EAC A8AA 1FAA 3F05 5C03
uid [ unknown] Launchpad PPA for Daniel Richter
/etc/apt/trusted.gpg.d/linuxmint-keyring.gpg
--------------------------------------------
pub rsa4096 2016-05-24 [SC]
302F 0738 F465 C153 5761 F965 A661 6109 451B BBF2
uid [ unknown] Linux Mint Repository Signing Key <root@linuxmint.com>
sub rsa4096 2016-05-24 [E]
/etc/apt/trusted.gpg.d/ubuntu-defaults.chroot.key.gpg
-----------------------------------------------------
pub rsa4096 2016-05-24 [SC]
302F 0738 F465 C153 5761 F965 A661 6109 451B BBF2
uid [ unknown] Linux Mint Repository Signing Key <root@linuxmint.com>
sub rsa4096 2016-05-24 [E]
/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
------------------------------------------------------
pub rsa4096 2012-05-11 [SC]
8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092
uid [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>
/etc/apt/trusted.gpg.d/ubuntu-keyring-2016-dbgsym.gpg
-----------------------------------------------------
pub rsa4096 2016-03-21 [SC]
F2ED C64D C5AE E1F6 B9C6 21F0 C8CA B659 5FDF F622
uid [ unknown] Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>
/etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg
------------------------------------------------------
pub rsa4096 2018-09-17 [SC]
F6EC B376 2474 EDA9 D21B 7022 8719 20D1 991B C93C
uid [ unknown] Ubuntu Archive Automatic Signing Key (2018) <ftpmaster@ubuntu.com>
Should I ask Qapla that question?
Linux Mint 21.1 Cinnamon, MATE & Xfce. Desktop computer 16 GB RAM. Windows 11. 22" & 24" monitors.
Linux Mint 21.1 Cinnamon on 256 GB USB flash drive. Dell Inspiron 13-7378 laptop. 16 GB RAM. Windows 10.