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Expand the /boot partition before the LVM partion using LUKS

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I am running Ubuntu 20.04. When I made a fresh installation I have chosen to encrypt the entire disk with LUKS and selected all the default settings.

%>lsblk
sda                     8:0    0 931.5G  0 disk  
├─sda1                  8:1    0   512M  0 part  /boot/efi
├─sda2                  8:2    0   732M  0 part  /boot
└─sda3                  8:3    0 930.3G  0 part  
  └─sda3_crypt        253:0    0 930.3G  0 crypt 
    ├─vgubuntu-root   253:1    0 929.3G  0 lvm   /
    └─vgubuntu-swap_1 253:2    0   976M  0 lvm  

After using the system for a few months, I would like to make the following changes:

1 - remove vgubuntu-swap_1 because I already have a swapfile in /

2 - expand vgubuntu-root to use all space available in sda3_crypt

3 - shrink sda3 by 4GB

4 - expand sda2 by 4GB

I have an Ubuntu 20.04 live USB but I am uncertain how these steps could be done without killing my system. The reason I want a bigger sda2 is because I want to store a few ISO in this partition such that GRUB can boot directly to those (eg. Clonzilla, Gparted) without touching my encrypted partition.

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