Why am I getting "Linux Mint End of Life" warnings?

[markg7605]

I had been using Linux Cinnamon Mint for several years on this computer, but installed LMDE 4 a year or so ago, then updated to LMDE 5 this year. They were all new, full installations, which wiped out the previous versions.

Yesterday, when I started Firefox, I got the screen shown below:

I didn't copy the URL for the message but it was from Linux Mint, and ended in "/debbie", if memory serves me right. I believe it was an legitimate LM site.

Here is my computer information, though I doubt this will have anything to do with the question:

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System:    Kernel: 5.10.0-17-amd64 x86_64 bits: 64 compiler: gcc v: 10.2.1 
           Desktop: Cinnamon 5.4.11 tk: GTK 3.24.24 wm: Mutter dm: LightDM Distro: LMDE 5 Elsie 
           base: Debian 11.2 bullseye 
Machine:   Type: Desktop System: Dell product: OptiPlex 7010 v: 01 serial: <filter> Chassis: 
           type: 15 serial: <filter> 
           Mobo: Dell model: 0WR7PY v: A02 serial: <filter> UEFI: Dell v: A15 date: 08/12/2013 
CPU:       Info: Quad Core model: Intel Core i7-3770 bits: 64 type: MT MCP arch: Ivy Bridge rev: 9 
           L2 cache: 8 MiB 
           flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 54278 
           Speed: 1804 MHz min/max: 1600/3900 MHz Core speeds (MHz): 1: 1804 2: 1751 3: 2139 
           4: 1750 5: 1770 6: 2375 7: 1745 8: 2174 
Graphics:  Device-1: Intel Xeon E3-1200 v2/3rd Gen Core processor Graphics vendor: Dell 
           driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:0162 
           Display: x11 server: X.Org 1.20.11 driver: loaded: modesetting unloaded: fbdev,vesa 
           resolution: 1920x1080~60Hz s-dpi: 96 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 4000 (IVB GT2) v: 4.2 Mesa 20.3.5 
           compat-v: 3.0 direct render: Yes 
Audio:     Device-1: Intel 7 Series/C216 Family High Definition Audio vendor: Dell 
           driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:1e20 
           Sound Server: ALSA v: k5.10.0-17-amd64 
Network:   Device-1: Intel 82579LM Gigabit Network vendor: Dell driver: e1000e v: kernel 
           port: f080 bus ID: 00:19.0 chip ID: 8086:1502 
           IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter> 
Drives:    Local Storage: total: 1.82 TiB used: 60.74 GiB (3.3%) 
           ID-1: /dev/sda vendor: Western Digital model: WD20EURX-57T0FY1 size: 1.82 TiB 
           speed: 3.0 Gb/s serial: <filter> 
Partition: ID-1: / size: 1.77 TiB used: 60.73 GiB (3.3%) fs: ext4 dev: /dev/dm-0 
           mapped: lvmlmde-root 
           ID-2: /boot/efi size: 285.4 MiB used: 3.4 MiB (1.2%) fs: vfat dev: /dev/sda1 
Swap:      ID-1: swap-1 type: partition size: 15.52 GiB used: 0 KiB (0.0%) priority: -2 
           dev: /dev/dm-1 mapped: lvmlmde-swap 
Sensors:   System Temperatures: cpu: 29.8 C mobo: 27.8 C 
           Fan Speeds (RPM): N/A 
Repos:     Packages: apt: 2274 
           No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb http: //packages.linuxmint.com elsie main upstream import backport
           2: deb https: //deb.debian.org/debian/ bullseye main contrib non-free
           3: deb https: //deb.debian.org/debian/ bullseye-updates main contrib non-free
           4: deb http: //security.debian.org/ bullseye-security main contrib non-free
           5: deb https: //deb.debian.org/debian/ bullseye-backports main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/official-source-repositories.list 
           1: deb-src http: //packages.linuxmint.com elsie main upstream import backport
           2: deb-src https: //deb.debian.org/debian/ bullseye main contrib non-free
           3: deb-src https: //deb.debian.org/debian/ bullseye-updates main contrib non-free
           4: deb-src http: //security.debian.org/ bullseye-security main contrib non-free
           5: deb-src https: //deb.debian.org/debian/ bullseye-backports main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/teamviewer.list 
           1: deb https: //linux.teamviewer.com/deb stable main
           Active apt repos in: /etc/apt/sources.list.d/vscode.list 
           1: deb [arch=amd64,arm64,armhf] http: //packages.microsoft.com/repos/code stable main
Info:      Processes: 239 Uptime: 12d 18h 55m Memory: 15.52 GiB used: 2.16 GiB (13.9%) 
           Init: systemd v: 247 runlevel: 5 Compilers: gcc: 10.2.1 alt: 10 Client: Cinnamon 
           v: 5.4.11 inxi: 3.3.01 

My question is: Why did I get a warning for an OS that I haven't used or had installed for at least a few years? Should I be concerned about this?

Thank you,

MarkG7605

[Cosmo.]

The interesting part of your post is the sentence, that you saw this after opening Firefox. So, the url of this site would be of interest.

[karlchen]

Educated guess:

• After having installed LMDE 5 from scratch, the old Firefox profile (~/.mozilla), was restored on the newly installed LMDE 5.
  (Hey, this is the procedure, which I keep on following on every new Mint installation.)
• The restored Firefox profile, backed up on LMDE 4 Debbie still, holds a setting, which tells that the Firefox homepage is https://www.linuxmint.com/start/debbie/ (where else should it point?
• This page, however, today simply displays the warning, which we read in the screenshot, shared with us in post #1. The page does not check anything and therefore it does not realize that the installed and running OS is LMDE 5, no longer LMDE 4.

Suggested solution:

• As trivial as reconfiguring the Firefox homepage to be https://www.linuxmint.com/start/elsie/

[mtwebster]

What is the output of:

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apt policy debian-system-adjustments