Do “lëkurë” and “leder” have any link with each other?

The Albanian lëkurë means ‘skin, bark’. The German Leder means ‘leather’.

Consulting Vladimir Orel’s Albanian Etymological Dictionary:

lëkurë ‘skin, bark’ < *lauk-urā

lakur ‘naked’ < *lauk-ura

In both cases, *lauk– is derived from Indo-European *leuk̂- ‘to shine, to be white’.

German Leder, English leather < Reconstruction:Proto-Germanic/leþrą < Proto-Indo-European *létrom ‘leather’. From The Oxford Introduction to Proto-Indo-European and the Proto-Indo-European World, it appears *létrom is a word specific to Celtic and Germanic.

So, doesn’t look like it.