A few weeks ago, I ran into a problem I never had in the past: a broken fstab file. My Ugreen NAS had a single character blocking my fstab file from being read, which kept the NAS from booting. Here’s how I saved it and brought it back to life without reinstalling the operating system.
A simple mistake took my Ugreen NAS down
I had no idea until a reboot kept it from booting again
I have a somewhat complicated homelab setup of my own making. So, that means some of my systems run a bit more on the janky side—especially my Ugreen NAS.
My Ugreen NAS, the iDX6011 Pro, has a pretty powerful processor with the Core Ultra 7. On the other hand, my main storage system, an old Lenovo RD440 rack-mount server running Unraid with 12 3.5-inch drive bays, has anemic 15 year old Xeon processors.
So, for my Plex setup, I have the media storage on the Lenovo because it has 80TB of storage across its 12 drives, while the Ugreen handles running Plex itself thanks to its solid Intel iGPU for transcoding. This means I have to mount my Unraid server over the network using NFS.
For some reason, Ugreen doesn’t allow for remote NFS mounts within UGOS, something that I was able to get around by modifying the /etc/fstab file—which ended up being my downfall.
While editing the fstab file, which is safe to do often, I somehow added a stray ' at the start of the file. This is completely harmless when the system is booted, and I never noticed the small error as whenever I jumped into the fstab file, I would just jump down to the area I needed to edit and edit there.
The problem came when the power went out at the house and I shut the server down to prevent a hard shutdown. Whenever I tried to boot the system again, it simply wouldn’t boot and gave me an error on the built-in display. That’s when the panic started to set in.
QuizQuirky and creative homelab projects
Trivia challenge
From Pi-holes to Proxmox clusters — how well do you know the wild world of homelab tinkering?
NetworkingHardwareSoftwareDIYSelf-Hosting
What is the primary purpose of running Pi-hole in a homelab?
Correct! Pi-hole acts as a DNS sinkhole, intercepting requests to known ad-serving and tracking domains before they ever reach your devices. It runs beautifully on a Raspberry Pi and can block ads for every device on your network without installing anything on individual gadgets.
Not quite — Pi-hole is a DNS-based ad blocker that works at the network level. Instead of filtering ads on each device separately, it intercepts DNS queries for known ad domains and returns nothing, effectively blocking them for your entire home network.
Which hypervisor platform is most popular among homelab enthusiasts for running multiple virtual machines on a single server?
Correct! Proxmox VE (Virtual Environment) is a free, open-source hypervisor based on Debian Linux that supports both KVM virtual machines and LXC containers. Its powerful web UI and active community have made it the go-to choice for homelab builders who want enterprise-grade features without the enterprise price tag.
The most popular choice is actually Proxmox VE, a free and open-source hypervisor built on Debian. Unlike VirtualBox or VMware Fusion, which are primarily desktop tools, Proxmox is designed to run headless on a server and manage dozens of VMs and containers through a sleek web interface.
What kind of software is Nextcloud, commonly self-hosted in homelabs?
Correct! Nextcloud is a self-hosted alternative to services like Google Drive or Dropbox, letting you store files, sync calendars, share photos, and even video chat — all on your own hardware. It’s one of the most popular self-hosted apps in the homelab community because it replaces so many paid cloud services at once.
Nextcloud is actually a personal cloud storage and collaboration platform — think of it as your own private Google Drive. Homelab enthusiasts love it because it lets them take back control of their data, syncing files, contacts, and calendars across devices without relying on a third-party cloud service.
What is a common homelab use for old enterprise switches picked up cheaply from eBay, such as a Cisco Catalyst?
Correct! Old enterprise switches like Cisco Catalysts are homelab gold — they support VLANs, link aggregation, and quality-of-service features that consumer switches lack entirely. Homelabbers use VLANs to logically separate IoT devices, guest networks, and trusted machines, adding a meaningful layer of security to their home setups.
The right answer is using them as VLAN-capable managed switches. Cheap enterprise switches from eBay are a homelab staple because they bring real network segmentation features home. With VLANs, you can isolate your sketchy smart fridge from your personal computers — a genuinely useful security practice.
What does the homelab tool Grafana primarily do?
Correct! Grafana is an open-source analytics and visualization platform that turns raw metrics into beautiful, interactive dashboards. Paired with data sources like Prometheus or InfluxDB, it’s commonly used in homelabs to display everything from CPU temperatures and network throughput to power consumption and disk I/O in real time.
Grafana is actually a data visualization tool that creates dashboards from metrics. In homelabs, it’s typically paired with Prometheus or InfluxDB to display system stats, network graphs, and sensor data in real time. Once you see your server’s CPU load as a glowing graph on a big monitor, there’s no going back.
What is a ‘NAS’ in the context of a homelab, and which brand is most commonly associated with beginner-friendly NAS devices?
Correct! NAS stands for Network-Attached Storage, and Synology is widely considered the most beginner-friendly brand in the space. Their DiskStation lineup runs a polished Linux-based OS called DSM, which makes it easy to set up file sharing, media streaming, and automated backups without touching a command line.
NAS stands for Network-Attached Storage, and Synology is the brand most associated with easy-to-use consumer and prosumer NAS devices. Their DSM operating system gives even newcomers a clean interface for managing drives, running apps, and backing up data — making it a classic first homelab purchase.
Which open-source project allows homelab users to self-host a full media server that can stream movies and TV shows to almost any device?
Correct! Plex Media Server is one of the most beloved homelab applications, letting you organize your personal media collection and stream it to phones, smart TVs, game consoles, and browsers. While Jellyfin is a fully free and open-source alternative, Plex pioneered the category and remains hugely popular thanks to its polished apps and remote access features.
The answer is Plex Media Server, which lets you host your own Netflix-style streaming service from your homelab. Jackett, Sonarr, and Bazarr are companion tools used to find and organize media, but Plex (or its open-source sibling, Jellyfin) is the actual server that streams it to all your devices.
What quirky homelab project involves setting up a miniature version of the internet’s routing infrastructure at home, often using software like BIRD or FRRouting?
Correct! Some dedicated homelabbers go deep enough to simulate BGP (Border Gateway Protocol) — the same routing protocol that underpins the entire internet — using software routers and tools like BIRD or FRRouting. Some enthusiasts even obtain their own ASN (Autonomous System Number) and a block of real IPv6 addresses to participate in the actual global routing table.
The answer is building a home BGP lab. BGP is the protocol that makes the real internet work by telling routers how to reach every network on earth. Hardcore homelabbers recreate this at home using virtual routers, and some even get their own ASN and IPv6 block to peer with real internet exchanges — a truly wild rabbit hole.
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Panic pushed me to figure out a solution instead of starting over
I was already heavily using the NAS in my homelab, and didn’t have backups set up yet
Just a few days prior to this event, I had another issue crop up in my homelab that pushed me to set up backups—only, I hadn’t set them up by the time this happened. So, I really couldn’t afford to completely reset the Ugreen NAS and start over when it stopped booting. I had to fix it.
I definitely was panicking as I tried to fix it at 10 PM that night, when my wife and I normally go to bed around 10:30 PM. So, I wasn’t firing on all cylinders at that point for sure. I had to fix it though.
So, with the help of ChatGPT and my knowledge of Linux servers, I set out to figure out what was going on. The first issue was the fact that I couldn’t get SSH’d into the system. It was on the network, but SSH was shut down because the root user didn’t have a password set for security purposes. So, I had to find another way in.
After a bit more panicking, I realized I could plug the NAS into my monitor via HDMI and plug a keyboard up, so that’s what I did. Once I had the keyboard and monitor hooked up, I could mash shift and escape to try to hit the grub bootloader, and that actually worked.
Once inside of the grub bootloader, I was able to edit the boot script to add rw init=/bin/bash to the end of the Linux line. This allowed me to gain access to the system’s native bash prompt on boot. Once I was into the operating system, the real debugging could begin.
The first thing I had to do was figure out why it wasn’t booting, which is when I started to look at the /etc/fstab file I mentioned earlier. I actually didn’t see anything wrong with the file at first, because it was rendering in a portion of my big monitor the size of the built-in screen on the Ugreen NAS.
However, once I took a picture of the fstab file and sent it to ChatGPT, it noticed the issue right away—a stray '. Yep, you read that right. At the beginning of my fstab file, there was an apostrophe. This meant that the system couldn’t read the entire fstab file because of one stray character at the start of the file.
Now I knew the issue, so it would be an easy fix, right? Wrong. The filesystem was mounted read only, so I couldn’t just edit the fstab file and be on my merry way. I needed to do a bit more work to fix my error. So, the next thing I had to do was actually make it so I could log into a proper root shell.
I had to set a password on the root user, because one didn’t exist yet. This was simple with passwd root, and then i could run exec /sbin/init to log into the root shell itself with the new password. At least I was now somewhere that I was familiar.
It took me quite a while to figure out how to mount the system so I could actually write to it, but the command that eventually worked was mount -n -o remount,rw -t overlay overlay /. Once I ran that command, I was able to actually edit the fstab file, remove the apostrophe, and get the system booting again.
The solution should work on almost any NAS this happens with
It’s an easy mistake, so be ready with the fix if you happen to make it
While I did this whole process on my Ugreen NAS, the same process will very likely work with any other NAS (or Linux based system in general) that you own.
At its core, Ugreen’s UGOS operating system is simply Debian Linux that’s customized with their software on top. So, the fixes that I employed here really do apply to most Linux operating systems.
It’s also a great reminder to be careful while editing core operating system files on your computer. I’ve edited fstab files on countless systems over the year, and it’s never been a problem in the past. But, all it took was one stray character to bring my entire homelab to its knees.
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- Brand
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UGREEN
- CPU
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Intel Core Ultra 7 255H
The Ugreen iDX 6011 Pro AI NAS is one of the most powerful NAS servers in the Ugreen lineup. With Intel’s Core Ultra 7 255H 16-core processor and 64GB of LPDDR5/x RAM onboard, there’s more than enough power to handle anything you can throw at this system. Add to that dual Thunderbolt 4 ports, dual 10GbE LAN ports, an OCuLink expansion port, and more, and you have a very solid network attached storage system.
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- Brand
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UGREEN
- CPU
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Intel 12th Gen N-Series
This cutting-edge network-attached storage device transforms how you store and access data via smartphones, laptops, tablets, and TVs anywhere with network access.
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- Drive Bays
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2
- Dimensions
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6.5″D x 3.94″W x 8.9″H
This diskless NAS lets you choose and use the best NAS hard drives for your needs.
Always work to fix a problem instead of just reinstalling
I could have just reinstalled my Ugreen NAS’ operating system and been up and running fairly quickly. However, that wouldn’t have taught me the valuable lesson of learning to fix the system.
I’m so glad that I spent the time to properly troubleshoot the system and get it back up and running instead of giving up early on like I was feeling tempted to do. I now have the knowledge to fix other systems where I might run across a similar issue in the future.