Proxmox installer is very limiting, especially in terms of partitioning. There is no "advanced" mode where you can choose your own mount points and layout as all popular distros offer. For example things like encrypting drives or moving boot to different drive are are easy on those distros installers but in proxmox not impossible. This is probably convenient for proxmox team because it greatly limits list of "supported" setups. Yet i think opening all possibilities and adding some warnings...
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