After doing some updates/upgrades (unfortunately I don't remember names of the packages) I am not able to boot into Kubuntu. It freezes on the "Breathing kubuntu logo".
When I hit escape, I can see following errors (I had to type them here manually, so it is possible, that I might make some typos):
[9.436029] [drm.intel_set_pch_fifo_underrun_reporting [1915]] *ERROR* uncleared pch fifo underrun
[9.436050] [drm.intel_pch_fifo_underrun_irq_handler [1915]] *ERROR* PCH transcoder A FIFO underrun
umount: Can't umount /cdrom: Device or resource busy
/init: line 7: can't open /dev/sr0: No medium found
(...) these two lines repeat quite a few times
[55.219834] SQUASHFS error: Unable to read fragment cache entry [aa3e07]
[55.220432] SQUASHFS error: Unable to read page, block aa3e07, size[7096]
(...) these two lines repeat quite a few times (just with different ...timecodes? in the square brackets at the beginning)
Bus error
[79.692133] SQUASHFS error: zlib decompression failed, data probably corrupt
[79.692701] SQUASHFS error: squashfs_read_data failed to read block 0xaa3e07
[55.219834] SQUASHFS error: Unable to read fragment cache entry [aa3e07]
[55.220432] SQUASHFS error: Unable to read page, block aa3e07, size[7096]
[79.753474] Kernel panic - not syncing: Attempt to kill init! exitcode 0x00000007
[79.753474]
[79.754639] CPU: 3 PID: 1 Comm: init Not tainted 4.4.0-31-generic #50-Ubuntu
[79.755230] Hardware name: LENOVO Lenovo G580/Product Name, BIOS SECN33WW (V2.03) 06/06/2012
[79.755836] 0000000000000086 00000000e62afd6d ffff88013a3f7c50 ffffffff813f1143
[79.756416] ffffffff81cb2b50 ffff88013a3f7ce8 ffff88013a3f7cd8 ffffffff8118bde7
[79.757006] ffff880000000010 ffff88013a3f7ce8 ffff88013a3f7c80 00000000e62afd6d
[79.757605] Call Trace:
(here I got lazy to hand-copy all timestamps and hexa information, I can provide it, if needed, information, that I skipped, is marked in {curly brackets})
[{timestamp}] [<{16 hexa digits}>] dump_stack+0x63/0x90
[{timestamp}] [<{16 hexa digits}>] panic+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] ? perf_event_exit_task+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] do_exit+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] do_group_exit+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] get_signal+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] do_signal+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] ? force sig_info_fault+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] ? __probe_kernel_read+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] ? mm_fault_error+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] exit_to_usermode_loop+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] prepare_exit_to_usermode+0x{hexa}/0x{hexa}
[{timestamp}] [<{16 hexa digits}>] retint_user+0x{hexa}/0x{hexa}
[79.765834] Kernel Offset: disabled
[79.766446] ---[ end Kernel panic - not syncing: Attempt to kill init! exitcode=0x00000007
[79.766446]
After that, I tried to do a fresh installment of Kubuntu 16.04 from USB.
In the boot manager from USB I've chosen to "Install Kubuntu".
It went as follows:
/dev/sda5: clean, 448332/1509600 files, 3769787/6054443 blocks
~.mount
ureadahead.service
{list of many .services}
systemd-rfkill.service
dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1\x2dpart7.swap
dev-disk-by\x2did-wwn\x2d0x50004cf20a67e83f\x2dpart7.swap
dev-disk-by\x2did-ata\x2dST1000LM024_HN\x2dm101MBB_S2SMJ9CD547736\x2dpart7.swap
dev-sda7.swap
dev-disk-by\x2duuid-df2bfbbd\x2de7ca\x2d4e37\x2d9b35\x2de51a38e0ab13.swap
systemd-fsckd.service
fsckd-cancel-msg:Press Ctrl+C to cancel all filesystem checks in progress
fsckd:1:0,0:Checking in progress on 1 disk (0,0% complete)
(... more similar fsckd output)
fsckd:1:14,3:Checking in progress on 1 disk (14,3% complete)
At this moment it freezes for a while, than it resumes to boot up (the "typical loading output" with [ OK ] at the beginning of the line.
(...)
[ OK ] Started Run snappy firstboot setup.
Welcome to emergency mode! After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, "systemctl default" or ^D to
try again to boot into default mode.
Press Enter for maintenance
(or press Control-D to continue):
After pressing Ctrl+D it repeated this exact message.
I have found some strategies, that have worked for other users, like typing "acpi=off" in the boot manager or disabling UEFI, but nothing helps. I also tried to repair my boot using the Boot Repair bootable USB. The "repair" happened without errors, but nothing has changed. Starting Kubuntu in recovery mode doesn't work either.
I thought, that maybe my HDD was broken, but dual booting into Windows 10 (installed on the same physical drive (just on another partition)) works just fine.
(I'm sorry for my english.)
