Resolved. The reason for the failure was in the archive itself. Was fixed by lvfs maintainer
I am using:  Distributor ID:  UbuntuDescription:  Ubuntu 22.04.3 LTSRelease:  22.04Codename:  jammy  Yesterday snap has showed that there is an update, but when I try to apply it, an error occurs.  cannot find Latitude_5X01_Precision_3541_1.26.0.cab in archive  From the console you can see that it even downloads something, but then falls into the same error. The file itself is on the LVFS website. And you can download it by hand. But I want to understand why the system itself cannot do this.   sudo fwupdmgr update Devices with no available firmware updates:  • 0000:00:1f.5 • TPM 2.0 • UEFI dbxDevices with the latest available firmware version: • Micron 2200S NVMe 256GB╔══════════════════════════════════════════════════════════════════════════════╗║ Upgrade System Firmware from 1.25.0 to 1.26.0?                               ║╠══════════════════════════════════════════════════════════════════════════════╣║ This stable release fixes the following issues:                              ║║                                                                              ║║ • This release contains security updates as disclosed in the Dell            ║║ Security Advisories.                                                         ║║                                                                              ║║ Latitude 5401 must remain plugged into a power source for the duration of    ║║ the update to avoid damage.                                                  ║╚══════════════════════════════════════════════════════════════════════════════╝ Perform operation? [Y|n]: yDownloading…             [***************************************]Downloading…             [***************************************]cannot find Latitude_5X01_Precision_3541_1.26.0.cab in archive
Cannot update UEFI firmware on Dell Latitude 5401 with snap or fwupdmgr. Cannot 
find Latitude_5X01_Precision_3541_1.26.0.cab in archive