Всех initrd в /boot. Плюсом ошибка grub - out of memory. Плюсом ошибка (как бы ошибка, внешне не нашел) в файле grub.cfg. Плюсом попытка создать дубль дял initrd 4.7.8. Пример:

prompt #] apt-get install expat-devel
Reading Package Lists... Done
Building Dependency Tree... Done
Selecting libexpat-devel for 'expat-devel'
The following NEW packages will be installed:
  libexpat-devel
0 upgraded, 1 newly installed, 0 removed and 62 not upgraded.
Need to get 41.2kB of archives.
After unpacking 149kB of additional disk space will be used.
Get:1 http://ftp.altlinux.org x86_64/classic libexpat-devel 2.1.0-alt1 [41.2kB]
Fetched 41.2kB in 0s (122kB/s)   
Committing changes...
Preparing...                       ################################################################################################### [100%]
1: libexpat-devel                  ################################################################################################### [100%]
Running /usr/lib/rpm/posttrans-filetriggers
Reloading httpd2 service:   [ DONE ]
Config file: /etc/initrd.mk
Generating module dependencies on host ...
Creating initrd image ...
Adding device-mapper support ...
Adding LUKS support ...
Adding modules ...
Adding modules (preload) ...
Adding modules (postload) ...
Adding rescue modules ...
Adding module dependencies ...
Generating module dependencies in image ...
Adding LVM support ...
Adding syslog support ...
Packed modules: ablk_helper aes-x86_64 aesni-intel ahci autofs4 crc16 cryptd dm-bufio dm-crypt dm-mod dm-snapshot evdev ext4 gf128mul glue_helper hid hid-generic input-leds jbd2 libahci libata lrw mbcache padlock-aes scsi_mod sd_mod sha256-ssse3 usb-common usbcore usbhid usbkbd usbmouse xhci-hcd xhci-pci 
Packing image to archive ...
Compressing image ...
Installing image ...
Removing work directory ...

Image is saved as /boot/initrd-4.7.8-un-def-alt1.img

Config file: /etc/initrd.mk.d/cifs.mk
Creating initrd image ...
Adding modules ...
Adding modules (preload) ...
Adding rescue modules ...
Adding module dependencies ...
Adding device-mapper support ...
Generating module dependencies in image ...
Adding LVM support ...
Adding syslog support ...
Packed modules: ahci cifs crc16 dm-bufio dm-mod dm-snapshot dns_resolver evdev ext4 fscache hid hid-generic input-leds jbd2 libahci libata mbcache scsi_mod sd_mod usb-common usbcore usbhid usbkbd usbmouse xhci-hcd xhci-pci 
Packing image to archive ...
Compressing image ...

An attempt to create two images with the same name. There is possibility
that you forgot to define IMAGE_SUFFIX or IMAGEFILE in one of the config files.

ERROR: Unable to overwrite the image /boot/initrd-4.7.8-un-def-alt1.img

make: *** [install] Error 1
make: *** [all] Error 1
extlinux-config: Boot device must be partition
/usr/lib/rpm/extlinux.filetrigger failed
Generating grub.cfg ...
Found theme: /boot/grub/themes/centaurus/theme.txt
Found linux image: /boot/vmlinuz-4.7.8-un-def-alt1
Found initrd image: /boot/initrd-4.7.8-un-def-alt1.img
Found linux image: /boot/vmlinuz-un-def
skipping symlink: /boot/vmlinuz-un-def
Found linux image: /boot/vmlinuz
Found initrd image: /boot/initrd.img
Found linux image: /boot/vmlinuz-4.3.0-un-def-alt1
Found initrd image: /boot/initrd-4.3.0-un-def-alt1.img
Found linux image: /boot/vmlinuz-4.2.5-un-def-alt1
Found initrd image: /boot/initrd-4.2.5-un-def-alt1.img
Found linux image: /boot/vmlinuz-std-def
skipping symlink: /boot/vmlinuz-std-def
Found linux image: /boot/vmlinuz-4.1.11-std-def-alt1
Found initrd image: /boot/initrd-4.1.11-std-def-alt1.img
Found linux image: /boot/vmlinuz-xen
skipping symlink: /boot/vmlinuz-xen
Found linux image: /boot/vmlinuz-4.7.8-un-def-alt1
Found initrd image: /boot/initrd-4.7.8-un-def-alt1.img
Found linux image: /boot/vmlinuz-4.3.0-un-def-alt1
Found initrd image: /boot/initrd-4.3.0-un-def-alt1.img
Found linux image: /boot/vmlinuz-4.2.5-un-def-alt1
Found initrd image: /boot/initrd-4.2.5-un-def-alt1.img
Found linux image: /boot/vmlinuz-4.1.11-std-def-alt1
Found initrd image: /boot/initrd-4.1.11-std-def-alt1.img
Found linux image: /boot/vmlinuz-xen
Found initrd image: /boot/initrd-xen.img
Found Windows 7 (loader) on /dev/sda1
Found memtest image: /boot/memtest-5.01.bin
error: out of memory.
error: syntax error.
error: Incorrect command.
error: syntax error.
Syntax error at line 471
Syntax errors are detected in generated GRUB config file.
Ensure that there are no errors in /etc/default/grub
and /etc/grub.d/* files or please file a bug report with
/boot/grub/grub.cfg.new file attached.done