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add POSTINSTALL-README

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# secureblue
After rebasing to secureblue, the following steps are recommended.
## Set a GRUB password
*to be added*
## Create a separate wheel account for admin purposes
Creating a dedicated wheel user and removing wheel from your primary user helps prevent certain attack vectors:
https://www.kicksecure.com/wiki/Dev/Strong_Linux_User_Account_Isolation#LD_PRELOAD
https://www.kicksecure.com/wiki/Root#Prevent_Malware_from_Sniffing_the_Root_Password
1. ```adduser admin```
2. ```usermod -aG wheel admin```
3. ```gpasswd -d {your username here} wheel```
4. reboot

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README.md
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@@ -154,6 +154,9 @@ To rebase an existing Silverblue/Kinoite installation to the latest build:
After installation, [yafti](https://github.com/ublue-os/yafti) will open. Make sure to follow the steps listed carefully and read the directions closely.
Have a look at [POSTINSTALL-README](POSTINSTALL-README.md).
#### Kargs
To append kernel boot parameters that apply additional hardening (reboot required):