Linux shell Upgrade from RpiOS-10 buster to RpiOS-11 bullseye, fast recipe.

Protocol:

 0 - Make rpi SD backup in other linux computer:
# dd if=/dev/mmcblk0 status=progress bs=5M | gzip -9 > rpi-sd-bck-$(date +%Y%m%d_%H%M%S).img.gz
 

1 - Check current version: 

$ lsb_release -a

 

No LSB modules are available.
Distributor ID: Raspbian
Description:    Raspbian GNU/Linux 10 (buster)
Release:        10
Codename:       buster

 

2- Update, Upgrade current version

# aptitude update

# aptitude upgrade -y

# aptitude dist-upgrade -y

 

3 - Update Rpi firmware (?)

# rpi-update

 

4 - Change sourceslist.list file: "buster" to "bullseye"

# nano /etc/apt/sources.list

 

old: 

deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi

new:
deb http://raspbian.raspberrypi.org/raspbian/ bullseye main contrib non-free rpi

5 - Update & Upgrade new OS version

# aptitude update

# aptitude upgrade -y

6 - Clean installation files

# aptitude autoclean

 

7 - Reboot the system

# reboot

 

8 - Check OS

$ lsb_release -a

 or

$ neofetch

  `.::///+:/-.        --///+//-:``    pi@rpi4 
`+oooooooooooo:   `+oooooooooooo:    -------  
 /oooo++//ooooo:  ooooo+//+ooooo.    OS: Raspbian GNU/Linux 11 (bullseye) armv7l  
 `+ooooooo:-:oo-  +o+::/ooooooo:     Host: Raspberry Pi 4 Model B Rev 1.4  
  `:oooooooo+``    `.oooooooo+-      Kernel: 5.10.103-v7l+  
    `:++ooo/.        :+ooo+/.`       Uptime: 13787B year 
       ...`  `.----.` ``..           Packages: 2098 (dpkg)  
    .::::-``:::::::::.`-:::-`        Shell: bash 5.1.4  
   -:::-`   .:::::::-`  `-:::-       Resolution: 3840x2160  
  `::.  `.--.`  `` `.---.``.::`      Terminal: /dev/pts/0  
      .::::::::`  -::::::::` `       CPU: BCM2711 (4) @ 1.500GHz  
.::` .:::::::::- `::::::::::``::.    Memory: 367MiB / 7847MiB  
-:::` ::::::::::.  ::::::::::.`:::-
::::  -::::::::.   `-::::::::  ::::                            
-::-   .-:::-.``....``.-::-.   -::-
.. ``       .::::::::.     `..`..
  -:::-`   -::::::::::`  .:::::`
  :::::::` -::::::::::` :::::::.
  .:::::::  -::::::::. ::::::::
   `-:::::`   ..--.`   ::::::.
     `...`  `...--..`  `...`
           .::::::::::
            `.-::::-`

9 - Check all your Rpi system.

bye.