Thanks for the suggestion @kaihengfeng. I installed linux-generic- hwe-16.04-edge, which gave me a working 4.15.0-23-generic after a reboot.
The log from 4.13.0-45 failed at this point: [ 2.444002] DMAR-IR: IOAPIC id 10 under DRHD base 0xdfffe000 IOMMU 0 [ 2.500002] DMAR-IR: IOAPIC id 9 under DRHD base 0xfedc0000 IOMMU 1 [ 2.556002] DMAR-IR: IOAPIC id 8 under DRHD base 0xfedc0000 IOMMU 1 [ 2.560000] DMAR-IR: Enabled IRQ remapping in xapic mode [ 2.616002] Switched APIC routing to physical flat. [ 2.620000] BUG: unable to handle kernel NULL pointer dereference at (null) [ 2.620000] IP: __bitmap_intersects+0x10/0x70 and the same section of dmesg from the working 4.15.0-23 is: [ 0.000000] DMAR-IR: IOAPIC id 10 under DRHD base 0xdfffe000 IOMMU 0 [ 0.000000] DMAR-IR: IOAPIC id 9 under DRHD base 0xfedc0000 IOMMU 1 [ 0.000000] DMAR-IR: IOAPIC id 8 under DRHD base 0xfedc0000 IOMMU 1 [ 0.000000] DMAR-IR: Enabled IRQ remapping in xapic mode [ 0.000000] Switched APIC routing to physical flat. [ 0.000000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 [ 0.020000] tsc: Fast TSC calibration using PIT [ 0.024000] tsc: Detected 2394.078 MHz processor [ 0.024000] Calibrating delay loop (skipped), value calculated using timer frequency.. 4788.15 BogoMIPS (lpj=9576312) ... etc. Maybe that will be useful for someone to track down what causes the crash. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1742675 Title: after upgrade to linux-image-extra-4.13.0-26-generic the system does not start at all To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1742675/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
