Troubleshooting
Articles in Troubleshooting.
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How to Fix a Proxmox VE VM That Won't Start (TASK ERROR Messages Explained)
Your Proxmox VM won't start and the task log just says TASK ERROR? Here's how to read the real error underneath, and fix the missing disks, full storage, and low RAM that usually cause it.
How to Fix a Wrong Keyboard Layout in Proxmox VE (Installer, noVNC Console, and Guest OS)
Typing the wrong characters in the Proxmox VE installer, the noVNC console, or inside a VM? Keyboard layout is set in three separate places. Here's how to find and fix all three.
How to Fix Common Backup Job Failures in Proxmox VE (vzdump and PBS Error Messages Explained)
Your Proxmox backup job just failed and the task log is a wall of red text. Here's what messages like "could not activate storage," "err -5," and "No space left on device" actually mean, and how to fix each one.
How to Fix "Only Root Can Do That" in Proxmox VE (PAM vs PVE Realm Permissions Explained)
Ran a qm or pct command over SSH and got slapped with "only root can do that"? It's almost always a mismatch between PAM and PVE realms, not a bug. Here's what's actually happening and how to fix it properly.
How to Fix a Windows VM Showing the Wrong Time in Proxmox VE (RTC and Local Time Explained)
Windows VMs in Proxmox VE often boot with a clock that's off by several hours. Here's why the RTC and local time setting causes it, and how to fix it for good, from the GUI or the qm command line.
How to Fix a Full /boot Partition in Proxmox VE by Removing Old Kernels
Proxmox VE's apt upgrade dies with 'No space left on device' and /boot is nearly full? Here's why old kernel packages pile up over time, and how to safely remove them without breaking proxmox-boot-tool or your bootloader.
How to Fix 'VM is Locked' Errors in Proxmox VE (qm unlock and pct unlock Explained)
Proxmox suddenly refuses to start, stop, or edit a VM and shows 'TASK ERROR: VM is locked (backup)' instead. Here's what these locks actually are, how to tell if it's safe to clear one, and the exact qm unlock and pct unlock commands for VMs and LXC containers.
How to Fix 'No Valid Subscription' and Repository Errors in Proxmox VE
Seeing a 'No valid subscription' pop-up or a 401 Unauthorized error when you run apt update on a fresh Proxmox VE install? Here's why it happens and the five-minute fix to switch to the free repository.
How to Fix 'Could Not Activate Storage' in Proxmox VE (NFS, CIFS, ZFS, and LVM Explained)
Proxmox throwing 'could not activate storage'? Here's how to diagnose and fix NFS, CIFS/SMB, ZFS pool, and LVM activation failures with the exact pvesm, zpool, and vgs commands, without guessing or rebooting blind.
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