I used to have partitions for Windows and Linux(had dual-boot) on my SSD, but then I broke the partitions with testdisk (because I didn't know what I was doing).
And now it looks like this:
$ sudo fdisk -l
Prints:
Disk /dev/sda: 238.5 GiB, 256060514304 bytes, 500118192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 57DA974A-6616-4D5B-A6C1-D1878D6653F2
Device Start End Sectors Size Type
/dev/sda1 11416512 11419391 2880 1.4M EFI System
/dev/sda2 12620768 12623647 2880 1.4M EFI System
/dev/sda3 22598488 22601367 2880 1.4M EFI System
/dev/sda4 26751712 26754591 2880 1.4M EFI System
/dev/sda5 56217864 56220743 2880 1.4M EFI System
/dev/sda6 56220744 56223623 2880 1.4M EFI System
/dev/sda7 60957632 60960511 2880 1.4M EFI System
/dev/sda8 96417586 97789569 1371984 669.9M Linux filesystem
/dev/sda9 126886816 126889695 2880 1.4M EFI System
/dev/sda10 140851301 149296322 8445022 4G Apple HFS/HFS+
/dev/sda11 199096632 209549623 10452992 5G Linux filesystem
/dev/sda12 328030206 498274301 170244096 81.2G Linux filesystem
I was able to boot my computer from my bootable Ubuntu USB ("Try before installing").
I'm not sure how (and if) I could recover my previous state.
Edit, additional info:
$ sudo gdisk -l /dev/sda
Partition table scan:
MBR: hybrid
BSD: not present
APM: not present
GPT: present
Found valid GPT with hybrid MBR; using GPT.
Disk /dev/sda: 500118192 sectors, 238.5 GiB
Model: SAMSUNG MZNLN256
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 57DA974A-6616-4D5B-A6C1-D1878D6653F2
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 500118158
Partitions will be aligned on 1-sector boundaries
Total free space is 309580991 sectors (147.6 GiB)
Number Start (sector) End (sector) Size Code Name
1 11416512 11419391 1.4 MiB EF00 EFI System Partition
2 12620768 12623647 1.4 MiB EF00 EFI System Partition
3 22598488 22601367 1.4 MiB EF00 EFI System Partition
4 26751712 26754591 1.4 MiB EF00 EFI System Partition
5 56217864 56220743 1.4 MiB EF00 EFI System Partition
6 56220744 56223623 1.4 MiB EF00 EFI System Partition
7 60957632 60960511 1.4 MiB EF00 EFI System Partition
8 96417586 97789569 669.9 MiB 8300
9 126886816 126889695 1.4 MiB EF00 EFI System Partition
10 140851301 149296322 4.0 GiB AF00
11 199096632 209549623 5.0 GiB 8300
12 328030206 498274301 81.2 GiB 8300