我的设置应用程序不见了,想从19.10回到LTS

I am new(+noob) to ubuntu. I used pop os icon pack a while ago and I thought I installed some pop applications along the way because whenever I updated system with sudo apt-get update && sudo apt-get upgrade that pop os packages were ready to be updated. So I installed stacer app to get rid of it. In the app I searched for 'pop' keyword and unistalled packages that I thought were related to pop. But after sometime I realized that my settings app is gone. I tried to restart the pc but I could not find it.

So I thought that update+upgrade command will fix this. And I also wanted to upgrade to 20.04 LTS. I tried sudo do-release-upgrade. It couldn't find new update so I changed prompt=normal in /etc/update-manager/release-upgrades and after using above update command I found out that I was getting update of ubuntu 19.10(eoan) so I stopped proccess.

update proccess cmd screenshot

现在,我想回到我的设置应用程序,并想回到18或20的LTS版本。我有什么方法可以升级到20 LTS而又不会丢失数据?

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