Install failed with "Failed to run pacstrap"

General system EndeavourOS installation
1

I just installed Ubuntu in one partition. Tried to install EndeavourOS in another got “failed to run pacstrap”.

My drive has 5 partitions: EFI, swap, ubuntu, EndeavourOS, and data. I was formatting the EFI and EndeavourOS partitions. EFI was mounted at /boot/efi and had the “boot” flag set. Ubuntu and data were mounted at /mnt/ubuntu and /mnt/mass_storage. All drives are ext4, except EFI which was FAT32.

There are 3 other drives on the system that were not touched.
ChatGPT said to check clock and update mirrorlist. I did that and still got same error.

https://termbin.com/t2g0

2

How did you update the mirrorlist and which mirrorlist did you update.

pacman is failing to download the files.

3 
2026-02-06 - 15:25:49 [6]: [PYTHON JOB]: "pacstrap: error: failed retrieving file 'linux-headers-6.18.7.arch1-1-x86_64.pkg.tar.zst.sig' from at.arch.mirror.kescher.at : Operation too slow. Less than 1 bytes/sec transferred the last 10 seconds" 
2026-02-06 - 15:25:49 [6]: [PYTHON JOB]: "pacstrap: warning: failed to retrieve some files" 
2026-02-06 - 15:25:49 [6]: [PYTHON JOB]: "pacstrap: error: failed to commit transaction (failed to retrieve some files)" 
2026-02-06 - 15:25:49 [6]: [PYTHON JOB]: "pacstrap: Errors occurred, no packages were upgraded." 
2026-02-06 - 15:25:49 [6]: [PYTHON JOB]: "pacstrap: ==> ERROR: Failed to install packages to new root" 
2026-02-06 - 15:25:49 [6]: virtual void Calamares::JobThread::run()

timeout on try getting kernel package..
I do not see it is using ranked mirrorlist, as log shows it is ranking them (would not be the case if ranked before on the live session)

4

Make sure you click the button in welcome that ranks the Arch mirrors and not only the EOS mirrors.

5

I used this command to update the mirrorlist:

sudo reflector –country US,CA –latest 20 –protocol https –sort rate –save /etc/pacman.d/mirrorlist

ChatGPT also said that a mirror was slow. I dropped all mirrors that didn’t end in EDU. It worked.

Thanks for your help, everyone!