I'd also like to add here that it is not necessary to install the libcurl3 package since you can just download it and extract the .so-file you need from there.
This is what I eventually did:
$ mkdir ~/libcurl3 &&cd ~/libcurl3
$ apt-get download -o=dir::cache=~/libcurl3 libcurl3
$ ar x libcurl3* data.tar.xz
$ tar xf data.tar.xz
$ cp-L ~/libcurl3/usr/lib/x86_64-linux-gnu/libcurl.so.4 /usr/lib/libcurl.so.3
$ cd&&rm-rf ~/libcurl3
What it does:
Create a temporary libcurl3 directory in your home path and go there
Download the libcurl3 package to the newly created folder
Extract a file named data.tar.xz from that package archive
Extract the data.tar.xz file to the current folder
Copy the referenced file of the libcurl.so.4 symlink to /usr/lib/libcurl.so.3 (don't mind the .4 suffix, as noted it is actually version 3)
Go back home and remove the temporary directory from your home path
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I'd also like to add here that it is not necessary to install the libcurl3 package since you can just download it and extract the .so-file you need from there.
This is what I eventually did:
What it does:
libcurl3directory in your home path and go theredata.tar.xzfrom that package archive/usr/lib/libcurl.so.3(don't mind the.4suffix, as noted it is actually version 3)