Ubuntu 18.04 on ThinkPad P50 (Part 4)

Conflict between libcurl3 and libcurl4

Ubuntu 18.04 includes libcurl4 by default which in fact is required by the packaged version of curl. Some legacy applications depend on libcurl3, which but libcurl3 conflicts with libcurl4. The steps below demonstrate how to alter the control file of such legacy packages to allow libcurl4 instead of libcurl3 and then how to repackage and install these packages.

People following these steps should test the updated legacy applications and confirm they run properly, or revert if they face any issue they cannot resolve.

tb@castor:~$ cd /tmp
tb@castor:/tmp$ mkdir dpkg
tb@castor:/tmp$ cd dpkg/
tb@castor:/tmp/dpkg$ apt download xxxsam osprules 
Get:1 http://ocdc.hursley.xxx.com/ocdc bionic-safe/XXX amd64 xxxsam amd64 3.06-4-ocdc6 [195 kB]
Get:2 http://ocdc.hursley.xxx.com/ocdc bionic-safe/XXX amd64 osprules amd64 1.00.1-2.precise-ocdc2 [34,7 kB]
Fetched 230 kB in 0s (708 kB/s)    
tb@castor:/tmp/dpkg$ ll
total 228
drwxr-xr-x  2 tb   tb       80 aug   26 17:54 ./
drwxrwxrwt 26 root root    680 aug   26 17:54 ../
-rw-r--r--  1 tb   tb   194938 márc  20  2015 xxxsam_3.06-4-ocdc6_amd64.deb
-rw-r--r--  1 tb   tb    34718 júl   13  2012 osprules_1.00.1-2.precise-ocdc2_amd64.deb
tb@castor:/tmp/dpkg$ fakeroot
root@castor:/tmp/dpkg# dpkg-deb -R xxxsam_3.06-4-ocdc6_amd64.deb xxxsam
root@castor:/tmp/dpkg# dpkg-deb -R osprules_1.00.1-2.precise-ocdc2_amd64.deb ospfules
root@castor:/tmp/dpkg# sed -i 's/libcurl3 (>= 7.16.2-1)/libcurl3 (>= 7.16.2-1) | libcurl4/' xxxsam/DEBIAN/control
root@castor:/tmp/dpkg# sed -i 's/libcurl3 (>= 7.16.2-1)/libcurl3 (>= 7.16.2-1) | libcurl4/' ospfules/DEBIAN/control
root@castor:/tmp/dpkg# sed -i 's/\(^Version:.*$\)/\1+dep1/' ospfules/DEBIAN/control
root@castor:/tmp/dpkg# sed -i 's/\(^Version:.*$\)/\1+dep1/' xxxsam/DEBIAN/control
root@castor:/tmp/dpkg# dpkg-deb -b xxxsam xxxsam_3.06-4-ocdc6+dep1_amd64.deb 
dpkg-deb: warning: conffile name '/etc/init.d/xxx-isambios' is duplicated
dpkg-deb: warning: conffile name '/etc/xdg/autostart/xxx-asset-management.desktop' is duplicated
dpkg-deb: warning: ignoring 2 warnings about the control file(s)
dpkg-deb: building package 'xxxsam' in 'xxxsam_3.06-4-ocdc6+dep1_amd64.deb'.
root@castor:/tmp/dpkg# dpkg -b ospfules osprules_1.00.1-2.precise-ocdc2+dep1_amd64.deb 
dpkg-deb: building package 'osprules' in 'osprules_1.00.1-2.precise-ocdc2+dep1_amd64.deb'.
root@castor:/tmp/dpkg# ll
total 452
drwxr-xr-x  4 root root    160 aug   26 18:06 ./
drwxrwxrwt 26 root root    680 aug   26 18:06 ../
drwxr-xr-x  7 root root    140 aug   26 18:00 xxxsam/
-rw-r--r--  1 root root 194938 márc  20  2015 xxxsam_3.06-4-ocdc6_amd64.deb
-rw-r--r--  1 root root 195024 aug   26 18:04 xxxsam_3.06-4-ocdc6+dep1_amd64.deb
drwxr-xr-x  4 root root     80 aug   26 18:00 ospfules/
-rw-r--r--  1 root root  34718 júl   13  2012 osprules_1.00.1-2.precise-ocdc2_amd64.deb
-rw-r--r--  1 root root  29128 aug   26 18:06 osprules_1.00.1-2.precise-ocdc2+dep1_amd64.deb
root@castor:/tmp/dpkg# exit
exit
tb@castor:/tmp/dpkg$ sudo apt install -f ./xxxsam_3.06-4-ocdc6+dep1_amd64.deb 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'xxxsam' instead of './xxxsam_3.06-4-ocdc6+dep1_amd64.deb'
The following packages will be upgraded:
  xxxsam
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/195 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 /tmp/dpkg/xxxsam_3.06-4-ocdc6+dep1_amd64.deb xxxsam amd64 3.06-4-ocdc6+dep1 [195 kB]
(Reading database ... 369572 files and directories currently installed.)
Preparing to unpack .../xxxsam_3.06-4-ocdc6+dep1_amd64.deb ...
Unpacking xxxsam (3.06-4-ocdc6+dep1) over (3.06-4-ocdc6) ...
Setting up xxxsam (3.06-4-ocdc6+dep1) ...
.
Processing triggers for systemd (237-3ubuntu10.25) ...
Processing triggers for ureadahead (0.100.0-21) ...
tb@castor:/tmp/dpkg$ sudo apt install -f ./osprules_1.00.1-2.precise-ocdc2+dep1_amd64.deb 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'osprules' instead of './osprules_1.00.1-2.precise-ocdc2+dep1_amd64.deb'
The following packages will be upgraded:
  osprules
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/29,1 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 /tmp/dpkg/osprules_1.00.1-2.precise-ocdc2+dep1_amd64.deb osprules amd64 1.00.1-2.precise-ocdc2+dep1 [29,1 kB]
(Reading database ... 369572 files and directories currently installed.)
Preparing to unpack .../osprules_1.00.1-2.precise-ocdc2+dep1_amd64.deb ...
Unpacking osprules (1.00.1-2.precise-ocdc2+dep1) over (1.00.1-2.precise-ocdc2) ...
Setting up osprules (1.00.1-2.precise-ocdc2+dep1) ...
Creating symbolic links ...
tb@castor:/tmp/dpkg$