/ boot is full on/sda1. I need to add unused 17g partition from/sdb6?

I have an unused partition on/sdb6 (my ошибка) that I need to merge into/sda1 to extend/boot. / boot is full and I have в crypt-luks fs on/sda2, but I don't see the button that allows я to provide the screenshot from GParted.

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000ea707

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      499711      248832   83  Linux
/dev/sda2          501758  1953523711   976510977    5  Extended
Partition 2 does not start on physical sector boundary.
/dev/sda5          501760  1953523711   976510976   83  Linux

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 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
Disk identifier: 0x2dffccca

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sdb2          206848   195086626    97439889+   7  HPFS/NTFS/exFAT
/dev/sdb3       195088382   976771071   390841345    5  Extended
/dev/sdb5       195088384   939128831   372020224   83  Linux
/dev/sdb6       939130880   976771071    18820096   82  Linux swap / Solaris

Disk /dev/mapper/crypt1: 999.9 GB, 999945142272 bytes
255 heads, 63 sectors/track, 121569 cylinders, total 1953017856 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/crypt1 doesn't contain a valid partition table

Disk /dev/mapper/ubuntu--vg-root: 987.1 GB, 987070726144 bytes
255 heads, 63 sectors/track, 120004 cylinders, total 1927872512 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table

Disk /dev/mapper/ubuntu--vg-swap_1: 12.8 GB, 12826181632 bytes
255 heads, 63 sectors/track, 1559 cylinders, total 25051136 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table
ubuntu@ubuntu:~$ mount
/cow on / type overlayfs (rw)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
/dev/sr0 on /cdrom type iso9660 (ro,noatime)
/dev/loop0 on /rofs type squashfs (ro,noatime)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
none on /sys/fs/pstore type pstore (rw)
systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd)
gvfsd-fuse on /run/user/999/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=ubuntu)
ubuntu@ubuntu:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/cow            8.8G  111M  8.7G   2% /
udev            8.8G   12K  8.8G   1% /dev
tmpfs           1.8G  1.4M  1.8G   1% /run
/dev/sr0        996M  996M     0 100% /cdrom
/dev/loop0      953M  953M     0 100% /rofs
none            4.0K     0  4.0K   0% /sys/fs/cgroup
tmpfs           8.8G  1.1M  8.8G   1% /tmp
none            5.0M  4.0K  5.0M   1% /run/lock
none            8.8G   80K  8.8G   1% /run/shm
none            100M   56K  100M   1% /run/user
ubuntu@ubuntu:~$ sudo du -h --max-depth=1 /
9.7M    /bin
5.2M    /boot
12K     /dev
5.8M    /etc
30M     /home
275M    /lib
0   /lib64
0   /media
0   /mnt
0   /opt
du: cannot access ‘/proc/7004/task/7004/fd/4’: No such file or directory
du: cannot access ‘/proc/7004/task/7004/fdinfo/4’: No such file or directory
du: cannot access ‘/proc/7004/fd/4’: No such file or directory
du: cannot access ‘/proc/7004/fdinfo/4’: No such file or directory
0   /proc
32K /root
du: cannot access ‘/run/user/999/gvfs’: Permission denied
1.5M    /run
18M /sbin
0   /srv
0   /sys
4.0K    /tmp
2.3G    /usr
155M    /var
995M    /cdrom
2.7G    /rofs
6.4G    /