My Lenovo Yoga Laptop with Xubuntu installed suddenly got weird glitches with the window messages, for example the window to restart the computer had no text or readable Buttons. I simply shut down by pressing the Power button, but after that i was not able to start it again.

The message prompting is telling me "default boot device missing or boot failed".

As recommended I tried using an USB-device with boot-repair, but it seems to me that the default-repair mechanism is not enough to fix this. I´m aware, that this could totaly be a really serious problem, as there are some quite important Files on that SSD, but well, it´s my fault if there was no recent backup.

This is the Info i got from the boot-repair:

Boot Info Script 8f991e4 + Boot-Repair extra info      [Boot-Info 25oct2017]


============================= Boot Info Summary: ===============================

 => Syslinux MBR (5.00 and higher) is installed in the MBR of /dev/sda.

sda1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  SYSLINUX 6.03
    Boot sector info:  Syslinux looks at sector 32800 of /dev/sda1 for its 
                       second stage. The integrity check of Syslinux failed. 
                       No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /boot/grub/grub.cfg /syslinux.cfg /casper/vmlinuz.efi 
                       /EFI/BOOT/grubx64.efi /ldlinux.sys

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________
Disk /dev/sda: 29.2 GiB, 31331450880 bytes, 61194240 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sda1    *          2,048    61,194,239    61,192,192   c W95 FAT32 (LBA)


"blkid" output: ________________________________________________________________

Device           UUID                                   TYPE       LABEL

/dev/loop0                                              squashfs   
/dev/sda1        4ED4-35BC                              vfat       BOOT-REPAIR
/dev/zram0       54ef746e-3e76-4179-8b85-32279801809f   swap       
/dev/zram1       a6a79ce6-bd02-4aef-8bd9-af05cae210f2   swap       
/dev/zram2       94070ac7-9e94-4a58-bbd2-f4f8824be5b8   swap       
/dev/zram3       47457b23-2365-4df9-826e-db03dbc09080   swap       

========================= "ls -l /dev/disk/by-id" output: ======================

total 0
lrwxrwxrwx 1 root root  9 Nov 18 22:35 usb-SanDisk_Cruzer_Blade_4C530001230816100151-0:0 -> ../../sda
lrwxrwxrwx 1 root root 10 Nov 18 22:35 usb-SanDisk_Cruzer_Blade_4C530001230816100151-0:0-part1 -> ../../sda1

================================ Mount points: =================================

Device           Mount_Point              Type       Options

/dev/loop0       /rofs                    squashfs   (ro,noatime)
/dev/sda1        /cdrom                   vfat       (ro,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)


=========================== sda1/boot/grub/grub.cfg: ===========================

--------------------------------------------------------------------------------

if loadfont /boot/grub/font.pf2 ; then
    set gfxmode=auto
    insmod efi_gop
    insmod efi_uga
    insmod gfxterm
    terminal_output gfxterm
fi

set menu_color_normal=white/black
set menu_color_highlight=black/light-gray

menuentry "Boot-Repair-Disk session" {
    set gfxpayload=keep
    linux   /casper/vmlinuz.efi  file=/cdrom/preseed/lubuntu.seed boot=casper quiet splash --
    initrd  /casper/initrd.lz
}
--------------------------------------------------------------------------------

============================== sda1/syslinux.cfg: ==============================

--------------------------------------------------------------------------------
DEFAULT loadconfig

LABEL loadconfig
  CONFIG /isolinux/isolinux.cfg
  APPEND /isolinux/
--------------------------------------------------------------------------------

=================== sda1: Location of files loaded by Grub: ====================

           GiB - GB             File                                 Fragment(s)

            ?? = ??             boot/grub/grub.cfg                             1

================= sda1: Location of files loaded by Syslinux: ==================

           GiB - GB             File                                 Fragment(s)

            ?? = ??             syslinux.cfg                                   1
            ?? = ??             ldlinux.sys                                    1


ADDITIONAL INFORMATION :
=================== log of boot-repair 20181118_2235 ===================
boot-repair version : 4ppa62
boot-sav version : 4ppa62
boot-sav-extra version : 4ppa62
glade2script version : 3.2.3~ppa4
boot-repair is executed in live-session (Boot-Repair-Disk 64bit 1oct2017, zesty, Ubuntu, x86_64)
CPU op-mode(s):      32-bit, 64-bit
file=/cdrom/preseed/lubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --
ls: cannot access '/home/usr/.config': No such file or directory

=================== os-prober:


=================== blkid:
/dev/sda1: LABEL="BOOT-REPAIR" UUID="4ED4-35BC" TYPE="vfat" PARTUUID="005785a4-01"
/dev/loop0: TYPE="squashfs"
/dev/zram0: UUID="54ef746e-3e76-4179-8b85-32279801809f" TYPE="swap"
/dev/zram1: UUID="a6a79ce6-bd02-4aef-8bd9-af05cae210f2" TYPE="swap"
/dev/zram2: UUID="94070ac7-9e94-4a58-bbd2-f4f8824be5b8" TYPE="swap"
/dev/zram3: UUID="47457b23-2365-4df9-826e-db03dbc09080" TYPE="swap"


=================== UEFI/Legacy mode:
This live-session is not in EFI-mode.
SecureBoot maybe enabled.


=================== PARTITIONS & DISKS:



=================== parted -lm:

BYT;
/dev/sda:31.3GB:scsi:512:512:msdos:SanDisk Cruzer Blade:;
1:1049kB:31.3GB:31.3GB:fat32::boot, lba;

BYT;
/dev/zram3:1031MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1031MB:1031MB:linux-swap(v1)::;

BYT;
/dev/zram1:1031MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1031MB:1031MB:linux-swap(v1)::;

BYT;
/dev/zram2:1031MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1031MB:1031MB:linux-swap(v1)::;

BYT;
/dev/zram0:1031MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1031MB:1031MB:linux-swap(v1)::;

=================== lsblk:
KNAME TYPE FSTYPE     SIZE LABEL
loop0 loop squashfs 629.3M
sda   disk           29.2G
sda1  part vfat      29.2G BOOT-REPAIR
zram0 disk          982.8M
zram1 disk          982.8M
zram2 disk          982.8M
zram3 disk          982.8M

KNAME ROTA RO RM STATE   MOUNTPOINT
loop0    1  1  0         /rofs
sda      1  0  1 running
sda1     1  0  1         /cdrom
zram0    0  0  0         [SWAP]
zram1    0  0  0         [SWAP]
zram2    0  0  0         [SWAP]
zram3    0  0  0         [SWAP]


=================== mount:
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=3998440k,nr_inodes=999610,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=805128k,mode=755)
/dev/sda1 on /cdrom type vfat (ro,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
/dev/loop0 on /rofs type squashfs (ro,noatime)
/cow on / type overlay (rw,relatime,lowerdir=//filesystem.squashfs,upperdir=/cow/upper,workdir=/cow/work)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=27,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12103)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
mqueue on /dev/mqueue type mqueue (rw,relatime)
configfs on /sys/kernel/config type configfs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime)
tmpfs on /run/user/999 type tmpfs (rw,nosuid,nodev,relatime,size=805124k,mode=700,uid=999,gid=999)
gvfsd-fuse on /run/user/999/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=999,group_id=999)


=================== ls:
/sys/block/sda (filtered):  alignment_offset bdi capability dev device discard_alignment events events_async events_poll_msecs ext_range holders inflight integrity power queue range removable ro sda1 size slaves stat subsystem trace uevent
/dev (filtered):  HID-SENSOR-2000e1.6.auto HID-SENSOR-2000e2.7.auto acpi_thermal_rel autofs block bsg btrfs-control bus char console core cpu cpu_dma_latency cuse disk dri drm_dp_aux0 ecryptfs fb0 fd full fuse hidraw0 hpet hugepages hwrng i2c-0 i2c-1 i2c-2 i2c-3 i2c-4 i2c-5 i2c-6 iio:device0 iio:device1 iio:device2 iio:device3 iio:device4 iio:device5 initctl input kmsg kvm lightnvm log mapper mcelog media0 mei0 mem memory_bandwidth mqueue net network_latency network_throughput null port ppp psaux ptmx pts random rfkill sda sda1 sg0 shm snapshot snd stderr stdin stdout uhid uinput urandom usb userio v4l vfio vga_arbiter vhci vhost-net vhost-vsock video0 zero
ls /dev/mapper:  control

=================== df -Th:

Filesystem     Type      Size  Used Avail Use% Mounted on
udev           devtmpfs  3.9G     0  3.9G   0% /dev
tmpfs          tmpfs     787M  9.3M  778M   2% /run
/dev/sda1      vfat       30G  714M   29G   3% /cdrom
/dev/loop0     squashfs  630M  630M     0 100% /rofs
/cow           overlay   3.9G   65M  3.8G   2% /
tmpfs          tmpfs     3.9G     0  3.9G   0% /dev/shm
tmpfs          tmpfs     5.0M  4.0K  5.0M   1% /run/lock
tmpfs          tmpfs     3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs          tmpfs     3.9G   60K  3.9G   1% /tmp
tmpfs          tmpfs     787M  8.0K  787M   1% /run/user/999

=================== fdisk -l:
Disk /dev/loop0: 629.3 MiB, 659873792 bytes, 1288816 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sda: 29.2 GiB, 31331450880 bytes, 61194240 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x005785a4

Device     Boot Start      End  Sectors  Size Id Type
/dev/sda1  *     2048 61194239 61192192 29.2G  c W95 FAT32 (LBA)


Disk /dev/zram0: 982.8 MiB, 1030561792 bytes, 251602 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/zram1: 982.8 MiB, 1030561792 bytes, 251602 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/zram2: 982.8 MiB, 1030561792 bytes, 251602 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/zram3: 982.8 MiB, 1030561792 bytes, 251602 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Error: no partitions

** (zenity:25556): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.


=================== Suggested repair
The default repair of the Boot-Repair utility would not act on the MBR.
Additional repair would be performed:  repair-filesystems


=================== User settings
The settings chosen by the user will not act on the boot.

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