Public bug reported:

System: Ubuntu 18.04 LTS (Lubuntu)
Package: grub-efi-amd64-signed 1.93+2.02-2ubuntu8

1) The system is Lubuntu 18.04. During its install the installer (ubiquity)
rebooted too soon without showing any success message. After reboot a new
record appeared in my rEFInd that contains word "vmlinuz" which boots
Lubuntu just fine.
2) The installer of KDE Neon (around 03.2018) reboots too early in the same 
vein.
3) After booting into the installed system and trying to `apt install`ing
a new package dpkg asks:
```
dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to 
correct the problem.
```.
4) Running `sudo dpkg --configure -a --debug=100` produces almost no
output and reboots the system.

$ cat stderr.log 
Installing for x86_64-efi platform.
$ cat stdout.log 
Setting up grub-efi-amd64-signed (1.93+2.02-2ubuntu8) ...

5) tail /var/log/dpkg

2018-05-08 20:57:39 startup packages configure
2018-05-08 20:57:39 configure grub-efi-amd64-signed:amd64 1.93+2.02-2ubuntu8 
<none>
2018-05-08 20:57:39 status half-configured grub-efi-amd64-signed:amd64 
1.93+2.02-2ubuntu8

6) A few days before it was producing more output, specifically the
sentence:

"Could not prepare Boot variable: No space left on device"

7)

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            1,5G     0  1,5G   0% /dev
tmpfs           300M  1,3M  299M   1% /run
/dev/sda7        95G  4,0G   86G   5% /
tmpfs           1,5G  6,8M  1,5G   1% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
tmpfs           1,5G     0  1,5G   0% /sys/fs/cgroup
/dev/sda4        96M   31M   66M  32% /boot/efi
tmpfs           300M   12K  300M   1% /run/user/1000

8) Laptop is Samsung R730 from 2010 (NP-R730-JS05RU), I guess it has EFI, not 
UEFI.
Support page (RU): http://www.samsung.com/ru/support/model/NP-R730-JS05RU

9) BIOS is the latest 07JD:

$ dmidecode
...
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: Phoenix Technologies Ltd.
        Version: 07JD.M027.20100927.KSJ
        Release Date: 09/27/2010
        Address: 0xE4960
        Runtime Size: 112288 bytes
        ROM Size: 2048 kB
        Characteristics:
                ISA is supported
                PCI is supported
                PC Card (PCMCIA) is supported
                PNP is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                ESCD support is available
                Boot from CD is supported
                ACPI is supported
                USB legacy is supported
                AGP is supported
                Smart battery is supported
                BIOS boot specification is supported
                Targeted content distribution is supported
        BIOS Revision: 7.0
...

Please, tell me which commands should I run to gather more information
for you to analyse.

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "dmesg.txt"
   https://bugs.launchpad.net/bugs/1769946/+attachment/5136247/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1769946

Title:
  package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 fails to install and
  reboots the system

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