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(base) david@XPS:~$ inxi -b
System: Host: XPS Kernel: 5.4.0-146-generic x86_64 bits: 64 Desktop: Xfce 4.16.0 Distro: Linux Mint 20.3 Una
Machine: Type: Desktop System: Dell product: XPS 8910 v: 1.1.0 serial: <superuser/root required>
Mobo: Dell model: 0WPMFG v: A00 serial: <superuser/root required> UEFI: Dell v: 1.1.0 date: 02/10/2017
CPU: Quad Core: Intel Core i7-6700 type: MT MCP speed: 800 MHz min/max: 800/4000 MHz
Graphics: Device-1: Intel HD Graphics 530 driver: i915 v: kernel
Device-2: NVIDIA GK208B [GeForce GT 730] driver: nvidia v: 470.161.03
Display: x11 server: X.Org 1.20.13 driver: modesetting,nvidia unloaded: fbdev,nouveau,vesa
resolution: 1680x1050~60Hz, 1920x1080~60Hz
OpenGL: renderer: NVIDIA GeForce GT 730/PCIe/SSE2 v: 4.6.0 NVIDIA 470.161.03
Network: Device-1: Intel Wireless 3165 driver: iwlwifi
Device-2: Qualcomm Atheros QCA8171 Gigabit Ethernet driver: alx
Drives: Local Storage: total: 931.51 GiB used: 361.77 GiB (38.8%)
Info: Processes: 289 Uptime: 9m Memory: 15.54 GiB used: 1.95 GiB (12.6%) Shell: bash inxi: 3.0.38
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(base) david@XPS:~$ apt update
[sudo] password for david:
Hit:1 http://mirror.cogentco.com/pub/linux/ubuntu focal InRelease
Get:2 http://dl.google.com/linux/earth/deb stable InRelease [1,807 B]
Ign:3 http://packages.linuxmint.com una InRelease
Get:4 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates InRelease [114 kB]
Hit:5 http://packages.linuxmint.com una Release
Get:6 http://mirror.cogentco.com/pub/linux/ubuntu focal-backports InRelease [108 kB]
Hit:7 https://brave-browser-apt-release.s3.brave.com stable InRelease
Hit:8 https://dl.winehq.org/wine-builds/ubuntu focal InRelease
Hit:9 https://repo.skype.com/deb stable InRelease
Hit:10 http://archive.canonical.com/ubuntu focal InRelease
Get:11 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Hit:12 http://deb.volian.org/volian scar InRelease
Get:13 https://content.runescape.com/downloads/ubuntu trusty InRelease [1,498 B]
Ign:14 https://ocean.surfshark.com/debianq focal InRelease
Hit:15 http://repository.spotify.com stable InRelease
Get:16 https://ocean.surfshark.com/debian stretch InRelease [2,313 B]
Err:17 https://ocean.surfshark.com/debianq focal Release
404 Not Found [IP: 2606:4700::6812:7822 443]
Err:2 http://dl.google.com/linux/earth/deb stable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4EB27DB2A3B88B8B
Get:18 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates/main amd64 Packages [2,464 kB]
Get:20 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates/main i386 Packages [804 kB]
Get:21 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates/main amd64 DEP-11 Metadata [274 kB]
Get:22 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates/universe amd64 Packages [1,046 kB]
Get:23 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates/universe i386 Packages [721 kB]
Get:24 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates/universe amd64 DEP-11 Metadata [409 kB]
Get:25 http://mirror.cogentco.com/pub/linux/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [944 B]
Get:26 http://mirror.cogentco.com/pub/linux/ubuntu focal-backports/main amd64 DEP-11 Metadata [7,960 B]
Get:27 http://mirror.cogentco.com/pub/linux/ubuntu focal-backports/universe amd64 DEP-11 Metadata [30.5 kB]
Err:16 https://ocean.surfshark.com/debian stretch InRelease
The following signatures were invalid: EXPKEYSIG 1DB7590E83C8F643 Surfshark package maintainer <admin@surfshark.com>
Get:28 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [2,082 kB]
Get:29 http://security.ubuntu.com/ubuntu focal-security/main Translation-en [338 kB]
Get:30 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [59.9 kB]
Get:31 http://security.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [95.7 kB]
Get:32 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 DEP-11 Metadata [940 B]
Reading package lists... Done
E: The repository 'https://ocean.surfshark.com/debianq focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://dl.google.com/linux/earth/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4EB27DB2A3B88B8B
E: The repository 'http://dl.google.com/linux/earth/deb stable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Skipping acquire of configured file 'non-free/binary-i386/Packages' as repository 'https://content.runescape.com/downloads/ubuntu trusty InRelease' doesn't support architecture 'i386'
W: GPG error: https://ocean.surfshark.com/debian stretch InRelease: The following signatures were invalid: EXPKEYSIG 1DB7590E83C8F643 Surfshark package maintainer <admin@surfshark.com>
E: The repository 'https://ocean.surfshark.com/debian stretch InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Thanks for any clue.