$ df -h
Filesystem                   Size  Used Avail Use% Mounted on
udev                         7.8G     0  7.8G   0% /dev
tmpfs                        1.6G  131M  1.5G   9% /run
/dev/mapper/ubuntu--vg-root  102G   59G   38G  62% /
tmpfs                        7.9G   19M  7.8G   1% /dev/shm
tmpfs                        5.0M  4.0K  5.0M   1% /run/lock
tmpfs                        7.9G     0  7.9G   0% /sys/fs/cgroup
/dev/loop0                   142M  142M     0 100% /snap/skype/38
/dev/loop1                    79M   79M     0 100% /snap/vscode/38
/dev/loop2                    80M   80M     0 100% /snap/vscode/42
/dev/loop3                   133M  133M     0 100% /snap/skype/41
/dev/loop4                   1.8M  1.8M     0 100% /snap/loop-rs/4
/dev/loop5                   128K  128K     0 100% /snap/hello/20
/dev/loop6                    87M   87M     0 100% /snap/core/4830
/dev/loop7                    87M   87M     0 100% /snap/core/4650
/dev/loop8                   138M  138M     0 100% /snap/skype/33
/dev/loop9                    87M   87M     0 100% /snap/core/4917
/dev/loop10                   79M   79M     0 100% /snap/vscode/37
/dev/sda1                    472M  340M  108M  76% /boot
/dev/sdb                     1.8T  1.6T  152G  92% /home
tmpfs                        1.6G   16K  1.6G   1% /run/user/121
tmpfs                        1.6G   80K  1.6G   1% /run/user/1000


$ ls -ahl /boot
total 331M
drwxr-xr-x  4 root root 4.0K Jul  4 09:06 .
drwxr-xr-x 27 root root 4.0K Jul  3 10:03 ..
-rw-r--r--  1 root root 1.5M Jan 19 03:56 abi-4.13.0-31-generic
-rw-r--r--  1 root root 1.5M May 28 07:10 abi-4.13.0-45-generic
-rw-r--r--  1 root root 1.5M Jun 11 16:25 abi-4.13.0-46-generic
-rw-r--r--  1 root root 1.4M Jan 25  2017 abi-4.8.0-37-generic
-rw-r--r--  1 root root 1.4M Mar  3  2017 abi-4.8.0-41-generic
-rw-r--r--  1 root root 209K Jan 19 03:56 config-4.13.0-31-generic
-rw-r--r--  1 root root 209K May 28 07:10 config-4.13.0-45-generic
-rw-r--r--  1 root root 209K Jun 11 16:25 config-4.13.0-46-generic
-rw-r--r--  1 root root 195K Jan 25  2017 config-4.8.0-37-generic
-rw-r--r--  1 root root 195K Mar  3  2017 config-4.8.0-41-generic
drwxr-xr-x  5 root root 1.0K Jul  4 09:06 grub
-rw-r--r--  1 root root  11M Feb 19 12:47 initrd.img-4.13.0-19-generic
-rw-r--r--  1 root root  57M Feb 19 12:47 initrd.img-4.13.0-31-generic
-rw-r--r--  1 root root  59M Jun 24 17:16 initrd.img-4.13.0-45-generic
-rw-r--r--  1 root root  59M Jul  3 10:04 initrd.img-4.13.0-46-generic
-rw-r--r--  1 root root  41M Feb 19 12:47 initrd.img-4.8.0-37-generic
-rw-r--r--  1 root root  41M Feb 19 12:47 initrd.img-4.8.0-41-generic
drwx------  2 root root  12K Sep  4  2016 lost+found
-rw-r--r--  1 root root 179K Jan 28  2016 memtest86+.bin
-rw-r--r--  1 root root 181K Jan 28  2016 memtest86+.elf
-rw-r--r--  1 root root 181K Jan 28  2016 memtest86+_multiboot.bin
-rw-r--r--  1 root root  255 May 28 07:10 retpoline-4.13.0-45-generic
-rw-r--r--  1 root root  255 Jun 11 16:25 retpoline-4.13.0-46-generic
-rw-------  1 root root 3.7M Jan 19 03:56 System.map-4.13.0-31-generic
-rw-------  1 root root 3.8M May 28 07:10 System.map-4.13.0-45-generic
-rw-------  1 root root 3.8M Jun 11 16:25 System.map-4.13.0-46-generic
-rw-------  1 root root 3.9M Jan 25  2017 System.map-4.8.0-37-generic
-rw-------  1 root root 3.9M Mar  3  2017 System.map-4.8.0-41-generic
-rw-------  1 root root 7.5M Jan 19 03:56 vmlinuz-4.13.0-31-generic
-rw-------  1 root root 7.6M May 28 07:10 vmlinuz-4.13.0-45-generic
-rw-------  1 root root 7.6M Jun 11 16:25 vmlinuz-4.13.0-46-generic
-rw-------  1 root root 7.2M Jan 25  2017 vmlinuz-4.8.0-37-generic
-rw-------  1 root root 7.2M Mar  3  2017 vmlinuz-4.8.0-41-generic