Lubis was born on 21 August 1906 in the city of Huta Godang, Onderafdeeling Mandailing en Natal, Afdeeling Padangsidempuan, Tapanuli Residency, Dutch East Indies.

[2] During the Japanese occupation of the Dutch East Indies, Lubis was appointed as the chairman of the Regional Defense Council of Mandailing Natal in 1943.

[3] Lubis, as the number one official in Mandailing Natal, decided to form a body to investigate the truth of the rumor on 8 September 1945.

On 3 October 1945, the mass meeting was finally held, and was attended by Mandailing Natal populace from cities and villages.

[6] After announcing the proclamation, the government of Mandailing Natal was tasked with forming the Indonesian National Committee.

After deliberation, the government decided that the formation of the Indonesian National Committee should be held at the capital of Tapanuli, Tarutung.

[4] On 12 September 1945, Junjungan Lubis, Kari Oesman, and Fachruddin Nasution departed from Padangsidempuan to Tarutung.

Junjungan Lubis, along with other delegates, appointed Abdul Hakim Harahap as the formateur of the Indonesian National Committee of Tapanuli.

After his resignation as the Regent of Batanggadis, his office was replaced by Fachruddin Nasution,[12] and he became the Deputy Military Governor of Tapanuli and East Sumatra.

[13] After the Indonesian National Revolution ended, Lubis was appointed by the governor of North Sumatra as the Regent of South Tapanuli — consisting of Angkola Sipirok, Padang Lawas, Mandailing Natal — in 1951.

The ceremony was led by Colonel Abdul Manaf Lubis from the Indonesian Army and Captain Hasibuan from the PRRI.

Edy Rahmayadi stated that Lubis was one of the figures who spread and grew Islam in South Tapanuli.