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Comments for Sergey's blog https://blog.sergem.net/ have to publish, sometimes Wed, 06 May 2026 18:32:04 +0000 hourly 1 https://wordpress.org/?v=6.1.6 Comment on Jailing IoT devices with OpenWRT by Alex https://blog.sergem.net/jailing-iot-devices-with-openwrt/#comment-50391 Wed, 06 May 2026 18:32:04 +0000 http://blog.sergem.net/?p=238#comment-50391 Thanks so much for this guide.
But the most weird (disturbing!) thing happens when I connect my new Qingping Air quality monitor to the jailed network – it won’t connect to the Internet!
My phone and laptop work completely fine on the jailed network.
These devices are so insidious, I can only assume that the first thing it does when it connects to wifi is to scan the local network, and when that fails, it gives up and declares the network useless.
The only way I can get it to work securely is to re-enable the wifi on my ISP’s router and connect it to that.

]]> Comment on Planning Trips with QMapShack by Steven Miller https://blog.sergem.net/planning-trips-with-qmapshack/#comment-24598 Sun, 20 Apr 2025 15:43:17 +0000 http://blog.sergem.net/?p=68#comment-24598 Really helpful!

Thank you!

]]> Comment on How to Install Ubuntu 14.04+ on MacPro 1,1 (EFI boot mode) by admin https://blog.sergem.net/how-to-install-ubuntu-14-04-on-macpro-11-efi-boot-mode/#comment-6799 Tue, 14 Nov 2023 17:24:28 +0000 http://blog.sergem.net/?p=135#comment-6799 In reply to Martin.

Martin, re: HDD detection – never had the issue. My setup could also be a bit different from yours, as I have my system drive (an M2 SSD in a PCI adapter) connected to one of the onboard SATA (not one of the 4 regular drive slots). Also, I tried this long time ago on Ubuntu 14.04, if you are trying some other Ubuntu version, the experience could be different. Re: server version to install – just install server, then “sudo apt install ubuntu-desktop”

]]> Comment on How to Install Ubuntu 14.04+ on MacPro 1,1 (EFI boot mode) by Martin https://blog.sergem.net/how-to-install-ubuntu-14-04-on-macpro-11-efi-boot-mode/#comment-6798 Tue, 14 Nov 2023 14:32:03 +0000 http://blog.sergem.net/?p=135#comment-6798 I try to install ubuntu on mac pro 1.1 using your guide.
I managed to configure the usb stick installer starts fine but fails at hdd detection “libc6-udeb” installation fails. I still wonder how to select which version to install, as Server is selected automatic.

Hardware:
HDD1 240GB
SSD 240GB
SSD 240GB
32GB Ram

]]> Comment on How I Built a Thermostat for NuHeat Floor by admin https://blog.sergem.net/how-i-built-a-thermostat-for-nuheat-floor/#comment-476 Fri, 30 Jul 2021 22:33:43 +0000 http://blog.sergem.net/?p=274#comment-476 In reply to Trevor Green.

Thanks. Headless is the way to go, unless you require controls and display at the point of use, as Chromium on PI zero pretty sluggish. If you can put a double box into wall, all the better! (I could not)

]]> Comment on How I Built a Thermostat for NuHeat Floor by Trevor Green https://blog.sergem.net/how-i-built-a-thermostat-for-nuheat-floor/#comment-475 Fri, 30 Jul 2021 21:05:53 +0000 http://blog.sergem.net/?p=274#comment-475 Very cool. I’m going to try something like this. Might go headless though and see about integrating this straight in to Home Assistant as I have 6 different pads and 6 controllers at present.

Perhaps a 2 gang box so there’s enough room for the relay/ADC/Pi zero/GFCI plug, just blind off the one Decora. Perhaps I can mate a small display to a Decora hole (even 3D print something) so there can be a local temp indicator.

Thoughts on that integration?

]]> Comment on Boot Ubuntu 18.04.1 Live USB on MacPro 1,1 by admin https://blog.sergem.net/boot-ubuntu-18-04-1-live-usb-on-macpro-11/#comment-472 Fri, 20 Nov 2020 16:47:26 +0000 http://blog.sergem.net/?p=313#comment-472 In reply to Chris.

Try disabling DVR-ROM (disconnect it) – this helped me on other platforms.

]]> Comment on Boot Ubuntu 18.04.1 Live USB on MacPro 1,1 by Chris https://blog.sergem.net/boot-ubuntu-18-04-1-live-usb-on-macpro-11/#comment-471 Fri, 20 Nov 2020 12:09:01 +0000 http://blog.sergem.net/?p=313#comment-471 In reply to Chris.

Update: I added nomodeset to the grub.cfg and I can see more of the kernel output. It tries to read from /dev/sr0, but fails after a large number of attempts. I assume this is the DVD-ROM? Anyway it eventually gives up trying to read from /dev/sr0 after many tries and says it cannot locate a live file system. It then offers to boot from the network. I checked that my PARTUUID was correct for sdb1 (the partition where the Ubuntu live filesystem resides), and it was not. So I fixed PARTUUID after checking it with blkid on another machine, and set it correctly. But it still ends up in the same state, trying to unsuccessfully read from /dev/sr0, then failing to boot the live file system.

]]> Comment on Boot Ubuntu 18.04.1 Live USB on MacPro 1,1 by Chris https://blog.sergem.net/boot-ubuntu-18-04-1-live-usb-on-macpro-11/#comment-470 Fri, 20 Nov 2020 09:23:41 +0000 http://blog.sergem.net/?p=313#comment-470 In reply to Chris.

I got a little bit further by adding noefi parameter back to grub.cfg. Now I can see kernel messages after the kernel starts to load. It stops at the following line:

fb0: switching to radeondrmfb from EFI VGA

It has been stuck here more than 10 minutes…

]]> Comment on Boot Ubuntu 18.04.1 Live USB on MacPro 1,1 by Chris https://blog.sergem.net/boot-ubuntu-18-04-1-live-usb-on-macpro-11/#comment-469 Tue, 17 Nov 2020 18:43:02 +0000 http://blog.sergem.net/?p=313#comment-469 I am trying this on my Mac Pro 1,1 with dual 3GHz Xeons, 9GB RAM and Radeon X1900 XT video card, using Ubuntu 20.04.1 on an 8GB USB, but so far I have not been able to boot into a live environment, just a black screen.

I have tried both disk creator in Ubuntu 20.04.1 and the manual method, both seem to end up with the same black screen. I followed the instructions with a few adjustments:

1. I removed the noefi parameter from grub.conf, as per instructions that it’s no longer needed. I have not tried it with the parameter, yet.
2. I used the correct name for initrd in my grub.conf

My Mac has no issues seeing and booting from the EFI usb. I get the grub menu, choose Linux and press enter. Then, I get a black screen with non-flashing cursor for a minute or so, then the screen goes completely blank… then… absolutely nothing seems to be happening. I have left it this way for at least 5 minutes, but nothing happens.

Any ideas? My Mac is fully up-to-date running 10.7.5 Lion, the latest supported OS X version. My plan if I can get a live environment to boot is to then shut it down and swap the current HDD for a spare 256GB SSD that I have lying around, then install pure Ubuntu on the SSD.

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