The mentioned error message greets me often when I start up my laptop. I have tried many methods mentioned in some answers, nothing helped.
- Installed dual boot for the second time (reinstalled because of same reason) following How can I dual-boot Windows 10 and Ubuntu on a UEFI HP notebook? as closely as possible.
Following that guide I have created a ~2 GB boot-partition with flags esp and boot (Note: the boot flag is now on the Windows-partition, I have no idea how it got there.), then the Windows partition, followed by the swap, the 20 GB Ubuntu "/" and the remaining as "/home" partition.
Number Start End Size Type File system Flags 1 1049kB 2149MB 2147MB primary fat32 esp 2 2149MB 378GB 376GB primary ntfs boot 3 378GB 384GB 6000MB primary linux-swap(v1) 4 384GB 500GB 116GB extended 5 384GB 404GB 20,0GB logical ext4 6 404GB 500GB 96,1GB logical ext4
I used boot-repair to restore grub after installing Windows (could not reach Ubuntu on my HDD, I used an USB-version). After that, for 3 days it worked well.
- Having had the dreaded error message again (no grub rescue, only "Press any key to continue"), I checked gParted and noticed the boot flag is on the wrong disk.
Looking for the grub folder, I found it to be in the 20 GB "/" partition as it should be. On the Windows partition, however, two strange folders appeared: Boot and boot-sav. The former contains folders like bg-BG (languages) with bootmgr.exe.mui and often, but not always, memtest.exe.mui:
BCD cs-CZ es-MX hu-HU nb-NO ro-RO tr-TR BCD.LOG da-DK et-EE it-IT nl-NL ru-RU uk-UA BCD.LOG1 de-DE fi-FI ja-JP pl-PL sk-SK zh-CN BCD.LOG2 el-GR Fonts ko-KR pt-BR sl-SI zh-HK bg-BG en-GB fr-CA lt-LT pt-PT sr-Latn-CS zh-TW BOOTSTAT.DAT en-US fr-FR lv-LV qps-ploc sr-Latn-RS bootvhd.dll es-ES hr-HR memtest.exe Resources sv-SE
The boot-sav is related to boot-repair, log and mbr_backups (empty) are in it.
- Using sudo fdisk -l, I got a warning: Partition 4 does not start on physical sector boundary.
- Could my partitioning theoretically work? (Somewhere I read the boot files should all be within the first 137 GB.)
- Should I simply change the boot flag back to the first, esp partition?
- Does having an SSHD have anything to do with my issue?
- Of course, what should I try to make my computer bootable without issues most of the time?
Other, maybe useful info from
Model: ATA ST500LM000-1EJ16 (scsi) Disk /dev/sda: 500GB Sector size (logical/physical): 512B/4096B Partition Table: msdos