Hi,
I had a similar trouble as yours : unable to install UT => https://github.com/ubports/ubports-installer/issues/1070
In fact, I previously installed an unofficial rom of LineageOS => https://forum.xda-developers.com/google-nexus-5/orig-development/rom-lineageos-16-0-nexus-5-t3921162
To do it, I needed to resize the partition => https://forum.xda-developers.com/showpost.php?p=79928889&postcount=190
So, I have done a revert partitionning and everything went well, I was able to install UT.
@doniks said in Libreoffice and Firefox.:
Going a bit off topic herexlsut can you use a simpler technical solution? like editing a text file with the ... five ? or so numbers you actually have to modify? does it have to be xls?
Thanks for your answer. 
In fact, it is a spreadsheet with equations. It is therefore an .xls file but can just as easily be an.ods file. However, I need the formulas....
Hi Everybody,
I am looking for an app to open (and modify) a .xls file in Ubuntu Touch. I have installed Libre Office Calc through Libertine but the Calc GUI is not usable in a Nexus 4 (too small scren).
Before installing LO Calc, I've tried "Document Viewer" which is in OpenStore but if it's possible to open the file, no way to modify it.
Is there anyone with another solution ?
Thanks.
Hi arubislander,
Thank you for your reply.
I did find requests on Github about the sorting possibilities on the name. I followed your advice and joined the ongoing requests => https://github.com/ubports/address-book-app/issues/12#issuecomment-552354416
It would be a great pleasure to help of implementing the features but I have not the skills to do it, unfortunately.
About my remark about the impossibility of exporting the address book, I just discovered that it is actually possible. I apologize for the mistake.