我正在使用 Parrot OS 最新版本。我已经尝试过所有其他的升级变体，例如以下，
apt --fix-broken install
运行后出现以下错误apt update && apt -y install openvpn-as
；
Hit:1 http://as-repository.openvpn.net/as/debian buster InRelease
Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:3 http://dl.google.com/linux/chrome/deb stable Release
Hit:4 https://deb.parrot.sh/parrot rolling InRelease
Hit:6 https://deb.parrot.sh/parrot rolling-security InRelease
Hit:7 https://packagecloud.io/AtomEditor/atom/any any InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
1 package can be upgraded. Run 'apt list --upgradable' to see it.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
openvpn-as : Depends: python-pyrad but it is not installable
E: Unable to correct problems, you have held broken packages.
有两种可升级的，其中一种是滚动的，提供商不建议升级，无论我尝试什么都无法升级，可升级的如下，
mimikatz/rolling 2.2.0-git20200208-0kali1 all [upgradable from: 2.2.0-git20200104-1parrot1]
mimikatz/now 2.2.0-git20200104-1parrot1 all [installed,upgradable to: 2.2.0-git20200208-0kali1]
我的鹦鹉存储库如下，
# parrot repository
# this file was automatically generated by parrot-mirror-selector
deb https://deb.parrot.sh/parrot/ rolling main contrib non-free
#deb-src https://deb.parrot.sh/parrot/ rolling main contrib non-free
deb https://deb.parrot.sh/parrot/ rolling-security main contrib non-free
#deb-src https://deb.parrot.sh/parrot/ rolling-security main contrib non-free
尽管我安装了 python3-pyrad，但我无法安装 python-pyrad。我该如何解决这个问题？