Canonical has withdrawn the Intel Microcode update that was released on November 11 for all supported versions of Ubuntu Linux. The update had problems launching some Intel Tiger Lake systems.
Νέα κενά ασφαλείας επηρεάζουν όλα τα συστήματα Linux που τρέχουν με συγκεκριμένους επεξεργαστές της Intel. Έτσι στις 10 Νοεμβρίου, η Intel κυκλοφόρησε νέα ενημέρωση για το Intel Microcode σε συστήματα Linux. Οι ενημερώσεις κυκλοφόρησαν μαζί με νέες εκδόσεις του Linux Kernel to address these new defects.
Canonical was fast enough to fix Intel Microcode packages on all supported versions of Ubuntu (Ubuntu 20.10, Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, Ubuntu 16.04 LTS and Ubuntu 14.04 ESM).
Unfortunately, the Intel Microcode update caused problems with some processors in the Intel Tiger Lake family, causing some systems to fail to boot. So Canonical now uses the Intel Microcode update to the previous one version only for Tiger Lake processor family.
The company informed them users that they can use the Kernel parameter dis_ucode_ldr in the boot menu to disable firmware loading in the event of a malfunction.
If you are using one of the supported versions of Ubuntu on a computer running an Intel Tiger Lake processor and have already installed yesterday's Intel Microcode update, it is recommended that you update the system again to the new Intel Microcode version already in the main repositories.
If you installed the Intel Microcode update yesterday and are having issues booting, you should use the kernel command line option above (dis_ucode_ldr) to prevent the firmware from loading with problems.
Then update your system from terminal using the commands.