gpart is a tool that could be used to scan for and recover lost or deleted partitions. It reads your hard drive for existing filesystems and then uses the info to guess for partitions.
gpart is available in Ubuntu's default apt repository but is not installed by default. You can install gpart on Ubuntu using apt from the terminal.
$ sudo apt update Hit:1 http://security.ubuntu.com/ubuntu focal-security InRelease Hit:2 http://jp.archive.ubuntu.com/ubuntu focal InRelease Get:3 http://jp.archive.ubuntu.com/ubuntu focal-updates InRelease [111 kB] Get:4 http://jp.archive.ubuntu.com/ubuntu focal-backports InRelease [98.3 kB] Fetched 210 kB in 1s (193 kB/s) Reading package lists... Done Building dependency tree Reading state information... Done All packages are up to date.
$ sudo apt install --assume-yes gpart Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: gpart 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 35.2 kB of archives. After this operation, 82.9 kB of additional disk space will be used.
$ sudo gpart Usage: gpart [options] device Options: [-b <backup MBR>][-C c,h,s][-c][-d][-E][-e][-f][-g][-h][-i] [-K <last sector>][-k <# of sectors>][-L][-l <log file>] [-n <increment>][-q][-s <sector-size>] [-V][-v][-W <device>][-w <module-name,weight>] gpart v0.2.3-dev (c) 1999-2001 Michail Brzitwa <email@example.com>. Guess PC-type hard disk partitions.
More options for gpart.
Options: -b Save a backup of the original MBR to specified file. -C Set c/h/s to be used in the scan. -c Check/compare mode. -d Do not start the guessing loop. -E Do not try to identify extended partition tables. -e Do not skip disk read errors. -f Full scan. -g Do not try to get the disk geometry. -h Show this help. -i Run interactively (ask for confirmation). -K Scan only up to given sector. -k Skip sectors before scan. -L List available modules and their weights, then exit. -l Logfile name. -n Scan increment: number or 's' sector, 'h' head, 'c' cylinder. -q Run quiet (however log file is written if specified). -s Sector size to use (disable sector size probing). -V Show version. -v Verbose mode. Can be given more than once. -W Write guessed primary partition table to given device or file. -w Weight factor of module.
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