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Repair grub screen after cloning working-Ubuntu and working-Windows-10 to Samsung SSD and then boot from SSD?

cn flag

I cloned my working Ubuntu 20.04 & Windows 10 HDD to Samsung SSD and when I boot from SSD & select Ubuntu, I get the grub command line screen as seen here. Windows 10 however boots successfully.

enter image description here

What should I do to get back the previous Ubuntu installation? Thanks.

oldfred avatar
cn flag
You may need fsck and a reinstall of grub. Lets see details, use ppa version with your live installer (2nd option) or any working install, not Boot-Repair ISO: Please copy & paste the pastebin link to the Boot-info summary report ( do not post report), do not run the auto fix till reviewed. https://help.ubuntu.com/community/Boot-Repair & https://sourceforge.net/p/boot-repair/home/Home/
cn flag
Please find boot-repair pastebin output here. http://paste.ubuntu.com/p/Jjv6Jgj5Vz/
oldfred avatar
cn flag
You show no Linux partition. You do have Ubuntu UEFI boot entry, but /EFI/ubuntu/grub.cfg wants to find full grub in hd0,gpt6 which does not exist. Suggest new install & restore from backup. Your Windows NTFS partitions look like they also all need chkdsk to resolve sector start issues.
cn flag
Thanks. Will boot-repair "recommended repair" OR "Advanced option" help? Or should I go for a new install as per your suggestion? Thanks.
oldfred avatar
cn flag
Without a Linux partition, there is nothing to repair. Use Windows to shrink NTFS partition & reboot & run chkdsk. Then install Ubuntu into the unallocated space. Be sure to boot in UEFI mode as how you boot install media, is then how it installs. https://help.ubuntu.com/community/UEFI Shows Windows screens https://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-10-with-uefi
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