树莓派提示 All packages are up to date. /无法升级到Bullseye

今天想折腾了，准备把自己树莓派4 从Buster升级到Bullseye

看网上教程要首先去/etc/apt/sources.list 和/etc/apt/sources.list.d里把Buster都改成Bullseye然后跑apt update

但是我自己跑了之后提示：

pi@raspberrypi:~ $ sudo apt update
Hit:1 http://raspbian.raspberrypi.org/raspbian bullseye InRelease              
Hit:2 http://archive.raspberrypi.org/debian bullseye InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.

没更新？？？？？

折腾了半天是这样解决的，先跑了apt policy看了下有没有pinned：

pi@raspberrypi:~$ apt policy
Package files:
 100 /var/lib/dpkg/status
     release a=now
  -1 http://archive.raspberrypi.org/debian bullseye/main armhf Packages
     release o=Raspberry Pi Foundation,a=stable,n=bullseye,l=Raspberry Pi Foundation,c=main,b=armhf
     origin archive.raspberrypi.org
  -1 http://raspbian.raspberrypi.org/raspbian bullseye/rpi armhf Packages
     release o=Raspbian,a=stable,n=bullseye,l=Raspbian,c=rpi,b=armhf
     origin raspbian.raspberrypi.org
  -1 http://raspbian.raspberrypi.org/raspbian bullseye/non-free armhf Packages
     release o=Raspbian,a=stable,n=bullseye,l=Raspbian,c=non-free,b=armhf
     origin raspbian.raspberrypi.org
  -1 http://raspbian.raspberrypi.org/raspbian bullseye/contrib armhf Packages
     release o=Raspbian,a=stable,n=bullseye,l=Raspbian,c=contrib,b=armhf
     origin raspbian.raspberrypi.org
  -1 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf Packages
     release o=Raspbian,a=stable,n=bullseye,l=Raspbian,c=main,b=armhf
     origin raspbian.raspberrypi.org
Pinned packages:
     wireguard-dkms -> 1.0.20210219-1 with priority 100
     wireguard-tools -> 1.0.20210223-1 with priority 100
     wireguard -> 1.0.20210223-1 with priority 100

发现确实有，是wireguard有关的东西干的，想了下是之前用了个脚本装的wireguard，他安装的时候只带了个拒绝升级到bullseye的选项我应该是选了yes......

解决方案：

cd /etc/apt/preferences.d #自己看一下/etc/apt/preferences这个文件里有没有别的被pin
sudo rm pivpn-limit-bullseye

树莓派提示 All packages are up to date. /无法升级到Bullseye

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