I tried following different answers like here [0], but all of these instructions fail because the system-config-lvm GUI reports the root partition as full, but when I boot into it I can check that only half of the disk space is actually used.
Here is the screenshot of the GUI:
edit
Output of df -h
Filesystem Size Used Avail Use% Mounted on
udev 946M 0 946M 0% /dev
tmpfs 193M 21M 173M 11% /run
/dev/mapper/ubuntu16server--vg-root 26G 16G 8.4G 66% /
tmpfs 965M 0 965M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 965M 0 965M 0% /sys/fs/cgroup
/dev/sda1 30G 11G 20G 35% /media/usb0
/dev/mmcblk0p2 473M 121M 329M 27% /boot
/dev/mmcblk0p1 511M 3.4M 508M 1% /boot/efi
tmpfs 193M 0 193M 0% /run/user/1000
Output of sudo pvs
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 4128768: Input/output error
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 4186112: Input/output error
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 4096: Input/output error
PV VG Fmt Attr PSize PFree
/dev/mmcblk0p3 ubuntu16server-vg lvm2 a-- 28.14g 16.00m
Output of sudo vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu16server-vg 1 2 0 wz--n- 28.14g 16.00m
Output of sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root ubuntu16server-vg -wi-ao---- 26.20g
swap_1 ubuntu16server-vg -wi-ao---- 1.93g
Output of df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
udev 241942 478 241464 1% /dev
tmpfs 247010 732 246278 1% /run
/dev/mapper/ubuntu16server--vg-root 1716960 135983 1580977 8% /
tmpfs 247010 1 247009 1% /dev/shm
tmpfs 247010 5 247005 1% /run/lock
tmpfs 247010 16 246994 1% /sys/fs/cgroup
/dev/sda1 0 0 0 - /media/usb0
/dev/mmcblk0p2 124928 301 124627 1% /boot
/dev/mmcblk0p1 0 0 0 - /boot/efi
tmpfs 247010 4 247006 1% /run/user/1000
[0] How can I resize an LVM partition? (i.e: physical volume)
